What units must be used to express the temperature in the equation for the ideal gas law? explain?

The ideal gas equation is pV = nRT.

Where T represents the temperature in abolute scale.

This is you have to use Kelvin scale ( in the International System of SI).

So, when you have the temperature in farenheit or celsius scales, which are not absolute, you need to make the conversion.

For expample, for celsius degrees you have to add 273.15, becuase Kelvin temperature = celsius temperature + 273.15.