Question

in the measuring air pressure illustration, what do the arrows pointing inside the tube represent?

• the air pressure entering the tube
• the air pressure pushing mercury into the tube
• the amount of mercury that originally fell to create empty space
• the heaviness of the mercury that balances the atmospheric pressure in the dish

Explanation:

In a mercury barometer, the atmospheric pressure on the mercury - dish pushes the mercury up the tube. The height of the mercury column is determined by the balance between the atmospheric pressure and the weight (heaviness) of the mercury column. The arrows inside the tube represent the weight of the mercury that balances the atmospheric pressure in the dish.

Answer:

the heaviness of the mercury that balances the atmospheric pressure in the dish