Hot Air Balloons

What gas is commonly used to inflate hot air balloons and make them rise?

In a hot air balloon, what is the large, colorful envelope filled with hot air called?

What is the name of the device used in hot air balloons to control the ascent and descent by releasing hot air?

Which brothers are credited with the first manned hot air balloon flight in 1783?

What is the term for the skilled practice of maneuvering a hot air balloon to specific locations by using different wind currents at various altitudes?