what are pneumatic tools powered by?\nselect the best option.\ncompressed air\nsand\nliquid\nhuman power

Answer

Brief Explanations:

Pneumatic tools operate using compressed air. The term "pneumatic" relates to air or gas. Compressed air is stored in a tank and then released to power the tool. Sand, liquid, and human power are not typical power sources for pneumatic tools.

Answer:

Compressed Air