6) Pressure

Question 1

What is the formula for pressure?

Answer 1

P = F/A

P: pressure (Pa)

F: force (N)

A: contact area (m²)

Question 2

What is the SI unit for pressure?

Answer 2

Pascal (Pa)

Question 3

Convert 1 cm² converted to m^2.

Answer 3

0.0001 m²

Question 4

What is the formula for pressure exerted by a liquid on the base of a container?

Answer 4

P = hpg

P: pressure (Pa)

h: height of liquid (m)
* p*: density of liquid (kg/m³)
g: gravitational field strength (N/kg)

Question 5

What is the approximate atmospheric pressure at sea level in Pa?

Answer 5

10⁵ Pa

Question 6

What is the insrtument used to measure atmospheric pressure?

Answer 6

A mercury barometer

Question 7

What is the pressure P?

(in terms of h, p, g and P₀)

Answer 7

P = hpg + P₀

P: Pressure on the left side of the manometer (Pa)

h: difference in height of liquid between the 2 sides (m)
p: density of liquid (kg/m³)
g: gravitational field strength (N/kg)

P₀: atmospheric pressure (approx. 10⁵ Pa)

Question 8

What is the relationship between the pressure exerted at cylinder Y and the pressure exerted at cylinder X?

Answer 8

P_X = P_Y

F₁/A₁ = F₂/A₂

P_X: pressure exerted at cylinder X

P_Y: pressure exerted at cylinder Y