Explain why a propane torch is lit inside a hot air balloon during preflight preparations. which gas law applies ?

The propane torch heats the air inside the balloon.

When heated at constant pressure, the volume of the air inside the balloon expands.

The gas law that applies is Charles’s law.

Explanation:

the ozone layer acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (uvr) from the sun, protecting life on earth from its potentially harmful effects. when the sky is clear, there is an inverse relationship between stratospheric ozone and solar uvr measured at the earth's surface.

in the analysis of systems that involve fluid flow, we frequently encounter the combination of properties u and pv.