It may have 1 kg of mass, but it's weight is not measured in kg, but in a force unit such as Newtons.Īs engineers and scientists we are supposed to be rigorous with our terms and units. A liter of water does not weigh 1 kilogram. Sorry to nitpick but you struck a nerve with me. NO! NO! NO! kg is not a force.even if you put the word force after it!!!!!! d-physics-problems.c om/hot-air-balloon-p hysics.htmlĭensity of helium = 0.164 kg/m 3 which is less than 0.946 kg/m 3 Compare this to normal (ambient) air density which is approximately 1.2 kg/m 3. This is the density of the heated air inside the envelope. Substituting the above three values into the Ideal gas law equation and solving for ρ we get ρ = 0.946 kg/m 3. The air inside the envelope is typically heated to an average temperature of about 100 degrees Celsius, which is 373 K The gas constant for dry air is 287 Joules/kg.K Normal atmospheric pressure is approximately 101,300 Pa T is the absolute temperature of the gas, in Kelvins (K)
P is the absolute pressure of the gas, in Pa With this in mind we can calculate the density of the heated air at a given temperature, using the Ideal gas law, as follows: The heated air inside the envelope is at roughly the same pressure as the outside air.
Let's examine the physics of a hot air balloon using a sample calculation.
0 kommentar(er)
