It's mostly used in CHEMICAL PROCESSES.
Answer:
<em>Digital clock is the most precised one</em>
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Explanation:
Answer:
The balloon will move forward.
The density of the air will be greater at the back of the balloon; similar
to the density of air being greater at lower altitudes due to gravitational
attraction because of the weight of the air in an air column.
A block of wood in water rises because of the difference in pressures
on the top and bottom of the block.