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SingaporePhysics

Mass, Weight, Density and Pressure

4 dot points across 4 inquiry questions. Click any dot point for a focused answer with worked past exam questions where available.

What is density, and how do we measure it for solids and liquids?

Define density, apply the relationship density equals mass over volume, and describe how to measure it
A focused answer to the O-Level Physics outcome on density. Density as mass per unit volume, the relationship and its rearrangements, measuring density for regular and irregular solids and liquids, and floating and sinking.
7 min answer →

How is the pressure of a gas measured, and what is atmospheric pressure?

Describe how a manometer and a mercury barometer measure gas and atmospheric pressure
A focused answer to the O-Level Physics outcome on gas pressure. Gas pressure from particle collisions, the manometer for measuring gas pressure, the mercury barometer for atmospheric pressure, and reading pressure from a liquid column.
7 min answer →

What is the difference between the mass of an object and its weight?

Distinguish mass from weight, relate weight to gravitational field strength, and explain why weight varies with location
A focused answer to the O-Level Physics outcome on mass and weight. Mass as the amount of matter, weight as the gravitational force, the relationship W equals mg, gravitational field strength, and why weight changes with location.
7 min answer →

What is pressure, and how does the pressure in a liquid change with depth?

Define pressure, apply pressure equals force over area, and calculate the pressure due to a liquid column
A focused answer to the O-Level Physics outcome on pressure. Pressure as force per unit area, the pascal, why pressure increases with depth in a liquid, and the relationship for the pressure of a liquid column.
8 min answer →