States of Matter

In the late 1700s a scientist and inventor named Jacques Charles helped create the first hydrogen-filled balloons. He discovered that the volume of a gas, such as hydrogen, will increase as the temperature of the gas is increased. Charles’s Law states that, for a fixed amount of gas at a constant pressure, the volume will change in direct proportion to a change in temperature. For instance, in a hot air balloon, as the gas inside the balloon is heated and the temperature increases, the volume of the gas expands, and the balloon gets larger.