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Vapor Pressure

Vapor pressure is a fundamental property of substances that describes the pressure of a vapor in equilibrium with its liquid or solid phase at a given temperature.
This property is crucial in various fields, including chemical engineering, atmospheric science, and materials science.
PubCompare.ai, an AI-driven resource, can help researchers optimize vapor pressure protocols by locating the best protocols from literature, pre-prints, and patents using AI comparisons.
This tool enhances reproducibility and research accurary, providing a one-stop-shop for vapor pressure optimization.
With PubCompare.ai, researchers can discover the most effective and reliable vapor pressure protocols to advance their studies.

Most cited protocols related to «Vapor Pressure»

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Publication 2012
1,6-hexanediol dimethacrylate Capillaries Ethanol Eye hexyl methacrylate Lens, Crystalline Light Mercury N,N-dimethyl-4-anisidine Polymerization Polymers Silicon Dioxide Ultraviolet Rays Vapor Pressure
The CFD simulations performed were similar to the previous nasal ECG (12 (link)) and oral EEG (18 (link)) studies and employed the Fluent 12 (ANSYS Inc.) software supplemented with user routines. In brief, a low Reynolds number (LRN) k-ω turbulence model was used to simulate the flow, which can be laminar, transitional, or turbulent at different locations in the flow field. This turbulence model has previously been used for the successful prediction of aerosol transport and deposition in upper airway models (26 (link),28 (link),29 (link)). To evaluate the variable temperature and relative humidity fields, the coupled governing equations of heat and mass transport, reported in detail by Longest and Xi (30 ) and Longest et al.(31 ), were used. Lagrangian transport equations coupled with user-defined functions were employed to estimate the particle trajectories, growth, and deposition. User-defined functions were implemented to improve estimation of near-wall conditions and to simulate the aerosol evaporation and condensation in the complex three-dimensional temperature and humidity fields (12 (link)). User-defined functions were also used to account for anisotropic near-wall turbulent dispersion, Brownian diffusion of the initially submicrometer aerosols, and near-wall interpolation of fluid velocities (12 (link)). Our previous studies have demonstrated that this combination of a commercial code with multiple user-defined functions is capable of accurately capturing particle deposition arising from inertia, sedimentation, diffusion, and turbulent dispersion (19 , 31 ). The Kelvin effect, influences of excipient and drug hygroscopicity, and the effect of droplet temperature on surface vapor pressure were considered in the droplet size change calculations based on previous studies (12 (link)). The influence of the droplet on the carrier phase was neglected and a one-way coupled approach was implemented in the model. The details of solving the above equations using realistic boundary conditions can be found in Longest et al. (12 (link)) and Tian et al. (18 (link)).
For simulating droplet trajectories and aerosol size increase, initially monodisperse size distributions were implemented. Condensational growth of the aerosols then led to a polydisperse aerosol size distribution within the airway models. With the control experiments, an initial droplet size of 3.6 μm was found to match the experimentally measured aerosol size exiting the nasal cannula and entering the NMT model. The aerosol size exiting the Aeroneb Lab nebulizer could not be implemented directly due to high depositional losses in the neonatal T-connector, which reduced the MMAD of the aerosol and was not included in the CFD model. For the EEG and ECG simulations, the experimentally measured size exiting the mixer tubing (900 nm) was implemented at the model inlet. In all droplet simulations, 9000 initial particles were injected into the steady state flow stream and increasing this number had a negligible effect on deposition fractions.
The computational mesh was constructed using the ANSYS ICEM 10 package (Ansys Inc., Canonsburg, PA) and consisted of tetrahedral and hexahedral elements. Hexahedral control volumes were used primarily in the connective tubing, cannula geometry, and tracheal region, whereas tetrahedral elements with a thin layer of near-wall wedge control volumes were used to resolve the nasal passages through the pharynx. Grid density testing produced convergent results in terms of regional deposition for a control volume cell count of approximately 1.3 million for the EEG NMT geometry and 1.5 million for the ECG NMT model.
Publication 2013
Anisotropy Cannula Diffusion Excipients Humidity Infant, Newborn Nasal Cannula Nasal Cavity Nebulizers Nose Pharmaceutical Preparations Pharynx Trachea Training Programs Vapor Pressure
Silicon Nitride (SiNx) membranes used in our experiments are commercially available as transmission electron microscope (TEM) windows (Norcada product # NT005X and NT005Z). Each membrane is made of 10-nm or 30-nm thick low-stress (<250 MPa) SiNx, deposited on 200-μm thick lightly doped silicon (Si) substrate by low-pressure chemical vapour deposition (LPCVD). A 50-μm × 50-μm window on the backside of the Si substrate is opened by a KOH anisotropic chemical etch. Prior to mounting into liquids, SiNx membranes can be cleaned in oxygen plasma for 30 s at 30 W to facilitate wetting of the membrane surface, though this is not a requirement. All solutions used were filtered and degassed prior to use. The absence of pre-existing structural damages (e.g. pinholes, nano-cracks) is inferred by the fact that no current (x membranes purchased from TEMWindows, and on custom fabricated SiNx membranes.
Publication 2014
Anisotropy Oxygen Plasma Silicon silicon nitride Tissue, Membrane Transmission Electron Microscopy Vapor Pressure
Details about measurements of µ23 by vapor pressure osmometry and solubility and of m-values of lacDBD unfolding are provided in Supplemental Materials. Calculations of ASA of model compounds (Table S1), PEG oligomers (Table S3), aromatic compounds (Table S6), and change in ASA of proteins processes (Table S5) are performed as described in SM. Analysis of experimental data including uncertainty estimations with Eqs of Table 1 were performed as described in SM.
Publication 2015
Osmometry Post-Translational Protein Processing Vapor Pressure
On the spheroid culture plate, a 15 μl cell suspension was dispensed into the access hole at each cell culture site to form a hanging drop (Fig. 1c). In order to prevent evaporation, 4 μl of distilled water was added into the peripheral water reservoir. In addition, the plate was sandwiched by a well-plate lid and a 96-well plate filled with distilled water, and wrapped using Parafilm (Fig. 1e). The growth media was exchanged every other day by taking 5 μl solution from a drop, and adding 7 μl fresh growth media into a drop. For the osmolality measurement, 10 μl sample solution was pipetted out from a drop and transferred to a vapor pressure osmometer (Vapro Model 5520, Wescor Inc., Logan, UT) for analysis.
Publication 2010
Cell Culture Techniques Cells Culture Media Vapor Pressure

Most recents protocols related to «Vapor Pressure»

Example 2

6 g of U3O8 (7.13 mmol ILOs; 21.4 mmol U) are added to 3 ml distilled water. The U3O8 and water are mixed, and 2.5 mL 70% nitric acid (15.8 M aqueous HNO3; 39.52 mmol HNO3; 2.49 g HNO3) is added and the resulting solution is mixed and placed in an acid digester. The nitric acid to U3O8 mass ratio is 0.5. The nitric acid to U3O8 mole ratio is 1.85. The vessel is sealed and pressurized to between 5 bar and 40 bar with argon, and heated with microwaves to between 200° C. to 250° C., with the temperature being increased at a ramp rate of 3° C./min to 20° C./min. The temperature is then maintained at between 200° C. to 250° C. for between 30 and 120 min. At the end of this time, the system is degassed to vent pressure, while remaining at a pressure above the vapor pressure of the digested solution to prevent boiling. This may be done by maintaining the temperature to 200° C. to 250° C., while partially reducing the pressure to a pressure which exceeds the vapor pressure of the digested solution at between 200° C. to 250° C. After partially reducing the pressure, the solution temperature is reduced to 30° C. The pressure is reduced to 1 atmosphere, and the product uranyl nitrate solution is unloaded.

Patent 2024
Acids Argon Atmosphere Blood Vessel Microwaves Moles Nitric acid Pressure Suby's G solution uranium octoxide Uranyl Nitrate Vapor Pressure

Example 1

According to this example there is provided a compound having the structural formula:

[Figure (not displayed)]

wherein R1, R2 and R3 are selected from the group consisting of alkyls, allyls, aryls, heteroaryls, hydrogen, non-metals and metalloids and where R1, R2 and R3 are different or the same.

Example 2

This example includes the elements of example 1 wherein R1, R2 and R3 are selected from the group consisting of alkyls selected from methyl, ethyl and/or propyl groups.

Example 3

This example includes the elements of example 1 wherein R1, R2 and R3 are methyl groups.

Example 4

This example includes the elements of example 1 wherein R1, R2 and R3 are selected from methyl and ethyl groups.

Example 5

This example includes the elements of example 1 wherein the compound indicates a vapor pressure of 0.1 Torr to 1.0 Torr over the temperature range 95° C. to 130° C.

Example 6

This example includes the elements of example 1 wherein the compound has a melting point of 67.2° C., plus or minus 5° C.

Patent 2024
Hydrogen Metalloids Metals Scandium scandium oxide Vapor Pressure
The Clausius–Clapeyron equation has been used to describe the relationship between temperature and vapor pressure for the BSTS system lnP1P2=-ΔHvapR1T1-1T2 , where P1 is the known vapor pressure at a known temperature in atm, P2 is the vapor pressure of interest in atm, T1 is the corresponding temperature for P1 in K, T2 is the temperature of the point of interest in K, ΔHvap is the enthalpy of vaporization in J/mol and R is the universal gas constant 8.314 J/(mol*K). The following is an example calculation of Se vapor pressure at 700 °C. The known temperature and pressure at the Se melting point are T1 = 494 K and P1 = 1.283e-5 atm, respectively. Converting the temperature of interest from Celsius to Kelvin yields T2 = 973 K. The heat of vaporization is ΔHvap = 95,480 J/mol, and the gas constant is R = 8.314 J/(mol*K). Solving for P2, P2 = 1.2 atm = 1.22 bar. ln1.283e-5P2=-954808.3141494-1973 , solving for P2, P2 = 1.2 atm = 1.22 bar. In addition, the internal pressure of an ampoule formula is S=Prt , where S is hoop stress in Pa, P is working pressure in Pa, r is the inside radius of the ampoule in mm and t is ampoule wall thickness in mm.
Publication 2023
Pressure Radius Vaporization Vapor Pressure
The effects of ripeness on osmotic water uptake and transpirational water loss were identified using six stages of ripeness (Fig. 2). The ripeness stages were: white, 1/2 light red, 3/4 light red, 1/2 red, 3/4 red, dark red21 (link). Fruits of ‘Florentina’ were selected based on color (CM-2600 d, orifice 3 mm diameter; Konica Minolta, Tokyo, Japan). The fruit selected ranged from white to dark red. Color was expressed as the hue angle. Rates of water uptake and transpiration were determined as indicated above. Additionally, juice was extracted from the fruit using a garlic press and its osmotic potential quantified by vapor pressure osmometry (VAPRO 5600; Wescor, Utah, USA). The skin permeances for transpiration (Pt; m s−1) and osmotic water uptake (Pf, m s−1) were determined from rates of water movement22 (link). Briefly, Pt was calculated from Eq. (1). The rate of transpiration (Ft; kg s−1) was divided by the product of the fruit surface area (A; m2), the density of water (ρw; kg m−3), and the gradient in water activity (Δɑw; dimensionless) across the fruit skin23 . Since the humidity above dry silica is practically zero, Δɑw equals the water activity of the strawberry juice, which is approximately one.
The value of Pf (m s−1) was determined using the filtration permeability relation in Eq. (2); where Ff (kg s−1) represents the rate of osmotic uptake, Afruit the fruit surface area (m2), R (m3 MPa mol−1 K−1) the universal gas constant, T (K) the absolute temperature, Vw (m3 mol−1) the molar volume of water and ρw (kg m−3) the density of water and ΔΨ (MPa) the difference in water potential between the water potential of the fruit (Ψfruit) and that of the incubation solution (Ψ)24 . For fruit incubated in water (Ψ = 0) the driving force for osmotic uptake is essentially equal to the water potential of the fruit (Ψfruit). The fruit water potential equals the sum of the fruit’s turgor and the osmotic potential of the expressed juice (ΨΠ). Because the fruit turgor is negligibly low in strawberry6 (link), the value of ΨΠ essentially equals the Ψfruit. Pt=FtAfruit·ρw·Δaw Pf=FfAfruit·ΔΨ·RTρ·Vw¯
Fruit surface area was calculated from a solid geometrical model comprising a truncated cone capped by two halves of rotational prolate ellipsoids6 (link). The respective dimensions were estimated from calibrated photographs by image analysis (cellSens Dimension 1.7.1; Olympus Soft Imaging Solutions, Münster, Germany). The relationship between mass and the measured surface area was plotted and an empirical regression model was fitted. Data from a compilation between different cultivars and development stages ranging from green fruitlets to fully mature fruit were used (see supplementary information). The total number of individual fruit replications was 200.
Publication 2023
DNA Replication Filtration Fruit Garlic Humidity Light Molar Osmometry Osmosis Permeability Prolate Retinal Cone Silicon Dioxide Skin Strawberries Vapor Pressure
We focus on two key traits that may impact phenological responses: overwintering stage and early versus late flight timing, here designated as Spring–Summer and Summer-mid-Fall flight timing43 (link). These two traits have been used in other studies and both have been shown to strongly relate to phenological responsiveness to both climate and landscape43 (link),44 (link). We determined the overwintering stage for mosquito species using literature resources (see Table 1 in “Results”). We classified species as Spring–Summer or Summer–mid-Fall flying by examining 50% flight period timing per species; species with bimodal peaks were classified as Spring–Summer. There is a clear bimodal distribution separating those species whose median flight timing is prior to early August and those whose 50% timing is later (Spring–Summer = before Julian Day (JD) 216, Summer–mid-Fall = after JD 216) (Supplementary Figs. 1, 2).
We carefully considered how to associate climatic data to our phenometrics before running models. While it remains possible that there are strong lag effects, where earlier climatic conditions have impacts on phenological sensitivity in a later part of the season, a logical first step is to use climatic conditions proximal to the phenological events being measured. We therefore opted to use Spring (March–mid June) summarized climatic conditions (e.g., average temperature, cumulative precipitation, and average vapor pressure deficit) for onset and summer/early Fall (late July—November) summarized climatic conditions for termination in initial model runs. While there is some variation in this timing across species, onsets and offset timing are within these seasonal time ranges or just after.
After assembling all the trait, climate and landscape data along with phenometrics, we fit linear mixed effects models (LMMs) with species as (intercept-only) random effects using the Imer package in R45 (link). We are interested in interactions between climate, landscape and traits in these models but we avoided overly complex three-way interactions and cases where collinearity among predictors was damaging. We evaluated damaging collinearity using variance inflation factors (VIFs) generated by the ‘vif’ function in the R package car46 , dropping two-way interactions that were highly collinear until all VIF scores were under 5. After fitting full models, we then used the function ‘step’ in the package lmerTest47 (link) to select the best model after stepwise variable reduction. We determined model diagnostics for our best models using the R package performance48 (link) and calculated marginal and conditional R2 values using the ‘r2_nakagawa’ function for mixed effects models49 (link). We used the function ‘plot_model’ in the R package sjPlot to generate effects plots for key predictors50 .
Publication 2023
Climate Culicidae Diagnosis Hypersensitivity Vapor Pressure

Top products related to «Vapor Pressure»

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The LI-6400 is a portable photosynthesis system designed for measuring gas exchange in plants. It is capable of measuring net carbon dioxide and water vapor exchange, as well as environmental conditions such as temperature, humidity, and light levels.
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The Vapro 5520 is a vapor pressure osmometer designed for measuring the osmolarity of aqueous solutions. It utilizes the chilled-mirror dew-point method to determine the vapor pressure of the sample and calculate the osmolality.
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The Vapor Pressure Osmometer is a lab equipment used for the measurement of osmotic pressure. It determines the osmolality of a solution by measuring the vapor pressure depression caused by the presence of solutes.
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The LI-6400XT is a portable photosynthesis system designed for measuring gas exchange in plants. It is capable of measuring net photosynthesis, transpiration, stomatal conductance, and other physiological parameters. The system consists of a control unit and a leaf chamber that encloses a portion of a plant leaf.
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The Vapro 5600 is a vapor pressure osmometer designed to measure the osmolality of aqueous solutions. It utilizes the dew-point method to determine the osmotic pressure of samples.
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The VAPRO Vapor Pressure Osmometer is a laboratory instrument used to measure the osmolality of a sample. It determines the osmotic pressure of a solution by measuring the vapor pressure of the solution. The instrument provides accurate and precise measurements of osmolality in biological and chemical samples.
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The 5520 Vapor Pressure Osmometer is a laboratory instrument used to measure the osmolality of a sample. It determines the osmotic concentration of a solution by measuring the vapor pressure difference between the sample and a reference solution.
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The Model 5520 is a laboratory instrument designed for the measurement of osmolality. It utilizes the freezing point depression method to determine the osmotic concentration of a sample. The device is capable of analyzing a wide range of sample types, including biological fluids, aqueous solutions, and other liquid samples.
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The CIRAS-2 is a portable gas exchange system designed for measuring the photosynthesis and respiration of plants. It provides precise and reliable measurements of carbon dioxide and water vapor exchange.
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More about "Vapor Pressure"

Vapor pressure is a fundamental property of substances that describes the pressure of a vapor in equilibrium with its liquid or solid phase at a given temperature.
This critical parameter is essential in various fields, including chemical engineering, atmospheric science, and materials science.
Researchers can optimize their vapor pressure protocols using AI-driven tools like PubCompare.ai.
This resource helps locate the best protocols from literature, preprints, and patents, enhancing reproducibility and research accuracy.
PubCompare.ai acts as a one-stop-shop for vapor pressure optimization, empowering researchers to discover the most effective and reliable protocols to advance their studies.
Vapor pressure is closely related to other key measurements and instrumentation, such as the LI-6400 and LI-6400XT portable photosynthesis systems, which can measure leaf transpiration and stomatal conductance.
The Vapro 5520 and Vapro 5600 vapor pressure osmometers are also valuable tools for measuring the osmolality of biological samples.
The CIRAS-2 portable photosynthesis system is another instrument that can provide insights into plant gas exchange and water relations.
By leveraging the power of AI and the wealth of available resources, researchers can optimize their vapor pressure protocols, leading to more accurate and reproducible results in their studies.
This knowledge can drive advancements in a wide range of scientific disciplines, from chemical engineering to atmospheric science and materials research.