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Gases 4 Me and Camilla

### barometer

a device that measures atmospheric pressure

### mm Hg

millimeters of mercury

### torr

milimeters of mercury, in honor of Torricelli`standard

### standard atmosphere

a unit of measurement for pressure equal to 760 mm Hg

### pascal

the SI unit of measurement for pressure; equal to one newton per square meter

### Boyle's Law

The volume of a given sample of gas at constant temperature varies inversely with the pressure

### absolute zero

-273 C is the lowest point, when converted to Kelvin, is 0. cannot be lower than this on Kelvin scale

### Charles's law

The volume of a given sample of gas at constant pressure is directly proportional to the temperature in kelvins

Equal volumes of gases at the same temperature and pressure contain the same number of particles (atoms or molecules)

### universal gas constant

The combined proportionality constant in the ideal gas law

### ideal gas law

An equation relation the properties of an ideal gas, expressed as PV=nRT The equation expresses behavior closely approached by real gases at high temperature and/or low pressure

### ideal gas

A hypothetical gas that exactly obeys the ideal gas law. A real gas approaches ideal behavior at high temperature and/or low pressure

### combined gas law

P1V1/T1 = P2V2/T2. It holds when the amount of gas is held constant.

### partial pressure

the independent pressures exerted by different gases in a mixture

### Dalton's law of partial pressures

For a mixture og ases in a container, the total pressure exerted is the sum of the pressures that each gas would exert if it were alone

### kinetic molecular theory

A model that assumes that an ideal gas is composed of tiny particles (molecules) in constant motion

### molar volume

The volume of one mole of an ideal gas; equal to 22.42 liters at standard temperature and pressure

### standard temperature and pressure

The condition 0 C and 1 atmosphere of pressure

Example: