What effect can sudden insolation from sunlight have on a gas balloon?

Question

Question Quiz BPL Gas - Balloon Pilot License - Principles of Flight (Balloon)

QuizVDS · Accepted Answer

The height at maximum differential pressure decreases.

QuizVDS · Answer

The height at maximum differential pressure increases.

QuizVDS · Answer

The hull pressure decreases.

QuizVDS · Answer

A sudden increase in rate of descent.

Id 402 - BPL Gas - What effect can sudden insolation from sunlight have on a gas balloon?