Pressure and Flotation

Question 1

What is the density of a substance?

Answer 1

Its mass per unit volume, measured in kgm-³

Question 2

What is pressure?

Answer 2

Force per unit area, measured in pascals (Pa)

Question 3

What is the approximate atmospheric pressure on you?

Answer 3

900kg

Question 4

What is one atmosphere?

Answer 4

1×10⁵Pa

Question 5

What effect does atmospheric pressure have on weather?

Answer 5

High pressure means dry, fine weather in summer and frosty nights in winter.
Low pressure means wet, windy and cloudy weather

Question 6

State Boyle’s law.

Answer 6

The volume of a fixed mass of gas is inversely proportional to its pressure, as long as temperature is constant.

Question 7

What is pressure due to a liquid?

Answer 7

Hydrostatic pressure

Question 8

What is absolute pressure?

Answer 8

Atmospheric and hydrostatic pressure combined

Question 9

What is a hydrometer?

Answer 9

An instrument used to gauge density of liquids

Question 10

State Archimedes’ principle.

Answer 10

Whenever an object is totally or partially immersed in a fluid, it experiences an upthrust that is equal to the weight of the fluid it displaces

Question 11

How would you demonstrate Archimedes’ principle?

Answer 11

Stone and overflow can.

Question 12

State the law of flotation.

Answer 12

Whenever an object is floating, the weight of the fluid displaced will equal the object’s weight