Pressure Units
Pressure is force exerted over this.
A surface area
STP on these slides is 1 atm and this temperature.
0 °C
Boyle’s law holds this quantity constant.
Temperature
Gay-Lussac’s pressure–temperature law holds this quantity constant.
Volume
The ideal gas law relates pressure, volume, temperature, and this.
Moles (n)
mmHg comes from this instrument of Torricelli’s.
The barometer
1 atm equals this many mmHg.
760
At constant temperature, volume and pressure are related in this way.
Inversely proportional
At constant volume, pressure and temperature are related in this way.
Directly proportional
This variable stands for the proportionality constant, used to make the units of P, V, n, and T fit.
R
A torr is another name for this unit.
mmHg
This is the pressure due to one gas in a mixture.
Partial pressure
Charles’s law holds this quantity constant.
Pressure
Gay-Lussac’s law of combining gases says gas volumes react in these ratios, at constant T and P.
Whole-number ratios
The value of R given on the slides is this, in L·atm/(mol·K).
0.0821
A pascal is one newton divided by this.
One square meter
Dalton’s law says total pressure equals the sum of these.
Partial pressures
At constant pressure, volume and temperature are related in this way.
Directly proportional
Avogadro’s law says volume is proportional to this, at constant T and P.
Number of molecules (or moles)
One mole of gas at STP occupies about this volume.
22.4 L
An atmosphere of pressure is the average air pressure here.
Sea level
Experiments are often measured under these conditions
Warming a balloon at constant pressure makes its volume do this
Expand
At constant temperature and pressure, reacting gases combine in whole-number volume ratios. That claim is this law.
Gay-Lussac’s law of combining gases
Graham’s law says effusion rates are inversely proportional to these, at constant T and P.
The square roots of their masses