Page 59 - Physics Form 5 KSSM_Neat

2.2 Atmospheric Pressure CHAPTER 2

Photograph 2.2 shows a glass sheet lifted using
Pressure
large rubber suckers. How is atmospheric Rubber sucker
pressure applied in the use of the rubber suckers?
Atmospheric pressure is the pressure due
KEMENTERIAN PENDIDIKAN MALAYSIA
to the weight of the layer of air acting on the
surface of the earth. The earth is surrounded by
a thick layer of air consisting of various types of
gases. This layer of air has weight and exerts a
pressure on the surface of the earth as well as all
objects on it. Therefore, all objects on the surface
of the earth experience atmospheric pressure.

Photograph 2.2 Glass sheet lifted using large
rubber suckers

Activity 2.4

Aim: To discuss atmospheric pressure from the aspect of the weight of the air acting on objects at
the surface of the earth
Instructions:
1. Carry out this activity in pairs.
2. Study situations 1 and 2.
Situation 1: Situation 2:
A diver in the sea experiences water Human beings living on land are
pressure. This water pressure is caused surrounded by air.
by the weight of the water column
acting on him.

3. Based on situation 1, explain the existence of atmospheric SCAN ME
SCAN ME
pressure on human beings in situation 2 from the aspect of the Video on the effects
weight of the air acting on him. of atmospheric
pressure
Discussion:
http://bit.ly/2FyJcLM
1. Discuss the similarities and differences between atmospheric
pressure and water pressure.
2. Estimate the atmospheric pressure at the surface of the earth. It is given that the thickness of
–3
–2
the atmosphere, h = 120 km, the average density of air, ρ = 8.5 × 10 kg m and gravitational
acceleration, g = 9.81 m s .
–2

LS 2.2.1 49