How many bars of helium is needed to lift 1500 kg?

Since bars is a measure of pressure, and what you need is volume (just think of having too small a volume, and no matter how much or little pressure, it will not lift 1500 kg). Here's how you calculate the volume needed. 1.

Calculate the difference in density between air and helium at 1 atmosphere of pressure. 2. Divide the 1500 kg by the above-mentioned difference in density.3.

Change the unit of the resulting volume to your favorite unit (e.g. Cc, liters, cubic feet, cubic meters, etc. ). The reason is that the lift is generated by the difference between the weight of helium and the weight of air it displaces. To get you started, the density of air at standard temperature and pressure is 1.2 kg/m^3 (engineeringtoolbox.com/air-properties-d_... ).

The density of helium in same is 0.18 kg/m^3 (chem.hawaii.edu/uham/lift.html ). To be more accurate, you should also take into account the weight of the balloon, but for most physics problems this tends to be neglected, or else folded into the weight being lifted. When it doesn't, the problem provides that weight.

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