A hot-air balloon plus cargo has a mass of 1740 {\rm kg} and a volume of 12030 {\rm m^3}. The balloon is floating at a constant height of 6.25 {\rm m} above the ground.

What is the density of the hot air in the balloon?

density= mass/volume

To find the density of the hot air in the balloon, we need to use the formula:

Density = Mass / Volume

Given:
Mass of the hot air balloon plus cargo = 1740 kg
Volume of the balloon = 12030 m^3

Substituting the values into the formula, we have:

Density = 1740 kg / 12030 m^3

Calculating this value:

Density ≈ 0.144 kg/m^3

Therefore, the density of the hot air in the balloon is approximately 0.144 kg/m^3.