How Is Pressure Measured?

Question 1

How can atmospheric pressure be measured?

Answer 1

Can be measured using a simple mercury barometer.

Question 2

Water can only be pumped higher than ______.

Answer 2

10m

Question 3

What 760 mm Hg represent in terms of pressure?

Answer 3

It corresponds to 1 ATM

Question 4

Why is there a vacuum in a barometer?

Answer 4

It has to be a vacuum as gas or liquid would hav its own pressure on the mercury and give off inaccurate reading.

Question 5

The barometer consists of a glass tube closed at one end and filled with pure _______. The tube is then inverted into an open vessel of mercury while the end of the tube is temporarily blocked on inversion. The mercury level in the tube _______ until the pressure due to the column becomes equal with ________ pressure acting outside the tube. The region above the tube is a _______, therefore pressure due to the mercury column is equal to atmospheric pressure.

Answer 5

Mercury
Drops
Atmospheric
Vacuum

Question 6

A manometer consists of a u tube containing a liquid. It used to measure ____ pressure. When both arms of the U are exposed to the ________the surfaces of the liquid, X and Y, are at the same horizontal level. This is because the same atmospheric pressure is exerted on both ______. If one arm is connected to the gas supply, the gas exerts pressure on X, this will cause Y to ______ until the pressure at ___, which is equal at the same as X, becomes equal to gas pressure.

Answer 6

Gas
Atmosphere 
Surfaces
Rise 
Z

Question 7

What is a hydraulic system and how does it work?

Answer 7

Works by using liquids under pressure. It makes use of two properties of liquids. Liquids are incompressible. If pressure is applied to an enclosed liquid, the pressure is transmitted to all parts of the liquid.

Question 8

Hydraulic systems in action:(2)

Answer 8

Used to lift heavy cars

Used in car brake systems