User:Kawiu2547/minerva.js

GAS LAWS. Gas laws are statements about how a given mass of air changes with varrying physical conditions. The physical conditions are the volume, pressure and temperature.

There are majorly three gas laws. These are Boyles,charles and gay-lussacs law Boyles law This law relates volume and pressure at constant temperature in Kelvin’s. Boyle’s law states that the volume of a constant mass of gas is inversely proportional to its pressure at constant temperature. Mathematically,this law can be expressed as V~1/P (at constant pressure) Introducing a constant K,it becomes V=K/P This can as well be written as VP=K. If a gas has a volume V1 and pressure P1,then if its volume or pressure changes at constant temperature,then V1P1=V2P2. EXAMPLES CHARLES LAW. Charles law states the volume of a given mass of gas is directly proportional to its temperature at constant pressure. Mathematically,this translates to V~T(at constant pressure) Introducing a constant K,this becomes V=KT. Thus V/T=K. If we consider a mass of a gas with volume V1 and temperature of T1,then it new physical properties with a change in one of them will be given by V1/T1=V2/T2(At constant pressure). The temperature should always be in units of kelvins. To change temperature from degrees celsius to kelvins,we usually add 273 to the temperature in degrees. 25 degrees Celsius temperature becomes (25+273)=298 kelvins. Examples. • Oxygen gas occupies a volume of 100cm3 at a temperature of 27 degrees Celsius. What would be its new volume if the temperature changes to 37 degrees Celsius (Assume pressure remains constant) Solution. Using charles law,V1/T1=V2/T2. We need to calculate V2. V2=V1T2/T1. V1=100 T1=273+27=300 k T2=310 k Thus V2=100*310/300 =310/3 cm3.

1 Gay-lussacs law States that for a given mass of gas at constant volume,its pressure is directly proportional to its absolute temperature. P~T Thus P=kT(at constant volume) P1/T1=P2/T2. Examples.

1 Combined Gas Law. This combines boyles,charles and gay-lussacs law. Mathematically,its expressed as V1P1/T1=V2P2/T2.

Examples