LOADING AWESOME
GAS LAWS
PART ONE
www.propofology.com
Dr. David Lyness
@Gas_Craic
WHAT IS A GAS?
A gas is a substance that is in its gaseous phase, but is above its critical temperature.
Critical temperature = temp above which a gas cannot be liquefied no matter how high the pressure.
A vapour = substance in the gaseous phase but is below its critical temperature.
Critical temperature = temp above which a gas cannot be liquefied no matter how high the pressure.
A vapour = substance in the gaseous phase but is below its critical temperature.
WHAT IS PRESSURE?
Pressure is defined as "the force per unit area acting at right angles to the surface under consideration” - Pressure = Force/Area
The unit of pressure is the Pascal. Pressure is the consequence of molecular bombardment of the surface by the gas.
The unit of pressure is the Pascal. Pressure is the consequence of molecular bombardment of the surface by the gas.
Kinetic energy is transferred to the surface and a force is produced that creates the pressure.
If the volume falls, the pressure goes up because the area for collisions fall and so more kinetic energy transfer per unit area.
WHAT IS TEMPERATURE?
“A measure of the average kinetic energy in a system and translates to the degree of hotness or coldness of that system” Temperature is measured in our clinical practice in the Celsius or Fahrenheit scales. In Physics it is the Kelvin. The divisions of the Kelvin and Celsius scale are the same but the start points differ. 0 celsius is 273K, so body temperature is 310K.
Now let’s consider the gas laws, each deal with one of three variables:
Pressure, Volume and Temperature.
Each law holds one constant and observes the variation in the other two.
Temperature is measured in Kelvin, pressure is in Pascals and volume is in Litres.
