Physics Of Hot Air Balloon Experiment

1808 Words Sep 5th, 2014 8 Pages
The following report explains the results of a model hot air balloon experiment that replicates a previous incident in which the temperature in the envelope was heated to a point until it was burned. After assessing the researched and calculated data, the assertion of the “air in the balloon becoming too hot” to lift the mass will be validated.
The physics related to the operation of hot air balloons is essentially the use of hot air to create a buoyant force and generate lift. A hot air balloon is made of a large bag called the envelope, a wicker basket or gondola hung underneath and a burner located beneath the hole in the envelope to heat the air in the envelope. This heated air causes a buoyant force to occur (Edmonds, 2008).
When an object is submerged in a fluid, it appears to weigh less than when it is outside of the fluid. The weight of the mass acts downwards, but when it is immersed in fluid, an upthrust or buoyant force is exerted by the fluid upwards (Edmonds, 2008). The buoyant force occurs because the pressure in a liquid or gas increases with increasing depth. Therefore, the pressure at the lower surface of a submerged object is greater than the pressure at its upper surface.
Diagram 1 shows an object that has the same density as water. It is found that the object is in static equilibrium, tending neither to rise nor sink (Nave, 2014). For this to happen, the downward gravitational force must be balanced by a net upward force from the surrounding…
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