What Is the Formula for Charles Law

Charles Law is a special case of the ideal gas law. It states that the volume of a fixed mass of a gas is directly proportional to the temperature.  This law applies to ideal gases held at a constant  pressure, where only the volume and temperature  are allowed to change. Charles Law is expressed as:Vi/Ti Vf/TfwhereVi initial volumeTi initial absolute temperatureVf final volumeTf final absolute temperatureIt is extremely important to remember the temperatures are absolute temperatures measured in Kelvin, NOT  °C or  °F. Charles Law Example Problems A gas occupies 221 cm3 at a temperature of 0 C and pressure of 760 mm Hg. What will its volume be at 100 C? Since the pressure is constant and the mass of gas doesnt change, you know you can apply Charles law. The temperatures are given in Celsius, so they must first be converted into absolute temperature (Kelvin) to apply the formula: V1   221cm3; T1   273K (0 273); T2   373K (100 273) Now the values can be plugged into the formula to solve for final volume: Vi/Ti Vf/Tf221cm3 / 273K Vf  /  373K Rearranging the equation to solve for final volume: Vf   (221  cm3)(373K) / 273K Vf   302 cm3