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I'm the first person to ride in a hydrogen balloon!
Jacques Charles was a French scientist and inventor who developed the gas law Charles' Law in 1793 that states that volume and temperature are directly proportional while the pressure is constant. He first tested his law when he launched one of the first hydrogen balloons in the air.
For example, this tire stays inflated because as the vehicle moves, the temperature of the air inside the tire rises. The air expands in volume provided that the air pressure doesn't change.
So, when the wheels on this bus turn, the temperature rises the volume of the tires expand so the pressure will stay constant. Charles discovered that the volume of gas depended on the temperature of the gas which can be seen in this example.
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