how hot air balloons work Essay

Submitted By Dayana8
Words: 406
Pages: 2


oldest successful human carrying flight technology first was created 1783 in paris by the Montgolfier brothers first passengers were a rooster, a duck and a sheep
1 month later first human carrying flight occurred, guy died

Hot air balloons are based on a very basic scientific principle: warmer air rises in cooler air. Essentially, hot air is lighter than cool air, because it has less mass per unit of volume. Each cubic foot of air contained in a hot air balloon can lift about 7 grams. That's not much, and this is why hot air balloons are so huge

Aka the law of volumes describes how gases tend to expand when heated.
When the pressure on a sample of a dry gas is held constant, the Kelvin temperature and the volume will be directly related. (GRAPH)

All air particles in the atmosphere are drawn by the downward force of gravity. But the pressure in the air creates an upward force working opposite gravity's pull. air pressure level is highest right at the surface of the Earth, pressure drops as you rise in altitude.
This difference in air pressure causes an upward buoyant force in the air all around us. Essentially, the air pressure is greater below things than it is above things, so air pushes up more than it pushes down. But this buoyant force is weak compared to the force of gravity -- it is only as strong as the weight of the air displaced by an object. Obviously, most any solid object is