Why don’t' we use vacuums anymore to collect hair and fibers?

Amanometer is used to measure the air pressure in a tank. the fluid used has a specific gravity of 1.25, and the differential height between the two arms of the manometer is 34 in. if the local atmospheric pressure is 12.7 psia, determine the absolute pressure in the tank for the cases of the

Which feature of a heating curve indicates a change ofn state

How is sound energy produced a. vibrating objects b. objects being heated c. temperature differences d. stationary objects