Answer: Chemical composition modification (or, physical signal would be color).
It was disproved by the discovery of the electrons
Just look it up on goog^le or a chart
Answer:
: kinetic energy is the energy transformation that occurs in a hot balloon.
Explanation:
Hot air balloons use a propane burner that converts chemical energy to thermal energy. The hot air is less dense than than the colder air and it lifts the balloon
