What is the Charles and boyles law?

The Charles and Boyles law, is a gas law that says that the pressure and volume of a gas have an inverse relationship, when temperature is held constant. I f you increase the pressure 10 times, the volume will decrease 10 times. You have a fixed mass of gas, so n (the number of moles) is constant. R is always constant - it is called the gas constant. Boyle's Law demands that temperature is constant as well.