Saturated vapour pressure of methyl acetate, ethyl acetate, n-propyl acetate, methyl propionate, and ethyl propionate

1965 ◽  
Vol 30 (10) ◽  
pp. 3526-3528 ◽  
Author(s):  
J. Polák ◽  
I. Mertl
Keyword(s):  
Ethyl Acetate ◽  
Vapour Pressure ◽  
Methyl Acetate ◽  
Propyl Acetate ◽  
Methyl Propionate ◽  
Ethyl Propionate ◽  
Saturated Vapour Pressure ◽  
Saturated Vapour ◽  
Acetate Methyl

scholarly journals Raoult’s law revisited: accurately predicting equilibrium relative humidity points for humidity control experiments

2016 ◽  
Author(s):  
Michael G. Bowler ◽  
David R. Bowler ◽  
Matthew W. Bowler
Keyword(s):  
Relative Humidity ◽  
Vapour Pressure ◽  
Control Device ◽  
Raoult’S Law ◽  
Simple Argument ◽  
Humidity Control ◽  
Saturated Vapour Pressure ◽  
Saturated Vapour ◽  
Equilibrium Relative Humidity ◽  
Raoult's Law

AbstractThe humidity surrounding a sample is an important variable in scientific experiments. Biological samples in particular require not just a humid atmosphere but often a relative humidity (RH) that is in equilibrium with a stabilizing solution required to maintain the sample in the same state during measurements. The controlled dehydration of macromolecular crystals can lead to significant increases in crystal order, which often leads to higher diffraction quality. Devices that can accurately control the humidity surrounding crystals on a beamline have led to this technique being increasingly adopted, as experiments become easier and more reproducible. Matching the relative humidity to the mother liquor is the first step to allow the stable mounting of a crystal. In previous work, we measured the equilibrium relative humidity for a range of concentrations of the most commonly used precipitants and showed how this related to Raoult’s law for the equilibrium vapour pressure of water above a solution. However, a discrepancy between measured values and those predicted by theory could not be explained. Here, we have used a more precise humidity control device to determine equilibrium relative humidity points. The new results are in agreement with Raoult’s law. We also present a simple argument in statistical mechanics demonstrating that the saturated vapour pressure of a solvent is proportional to its mole fraction in an ideal solution: Raoult’s Law. The same argument can be extended to the case where solvent and solute molecules are of different size, as is the case with polymers. The results provide a framework for the correct maintenance of the RH surrounding samples.SynopsisThe equilibrium relative humidity values for a number of the most commonly used precipitants in biological macromolecule crystallisation have been measured using a new humidity control device. A simple argument in statistical mechanics demonstrates that the saturated vapour pressure of a solvent is proportional to its mole fraction in an ideal solution (Raoult’s Law). The same argument can be extended to the case where solvent and solute molecules are of different size.

scholarly journals The reflection of vapour molecules at a liquid surface

1931 ◽  
Vol 131 (818) ◽  
pp. 554-564 ◽  
Keyword(s):  
Kinetic Theory ◽  
Vapour Pressure ◽  
Liquid Surface ◽  
Unit Area ◽  
Kinetic Theory Of Gases ◽  
Perfect Gas ◽  
Saturated Vapour Pressure ◽  
Saturated Vapour ◽  
First Approximation ◽  
Rate Of Evaporation

The rate of evaporation of a liquid may be calculated from the kinetic theory of gases if it be assumed that all vapour molecules which strike the surface enter the liquid and that, as a first approximation, the vapour behaves as a perfect gas. Under these circumstances, it follows from the kinetic theory of gases that m = mass of molecules leaving unit area per minute = mass of molecules striking unit area per minute from the saturated vapour = 14·63 P s /√T s gram/sq. cm. /min., where P s is the saturated vapour pressure in millimetres of mercury at the surface temperature T s ° A.

Saturated Vapour Pressure and Enthalpy of Sublimation of Nickel

1992 ◽  
Vol 2 (3) ◽  
pp. 97-100 ◽  
Author(s):  
Valerii I. Severing ◽  
Alla V. Tseplayaeva ◽  
Nonna E. Khandamirova ◽  
Yurii A. Priselkov ◽  
Natalya A. Chernova ◽  
...  
Keyword(s):  
Vapour Pressure ◽  
Enthalpy Of Sublimation ◽  
Saturated Vapour Pressure ◽  
Saturated Vapour
Sign in / Sign up

Export Citation Format

Share Document