Physics Tuition Singapore O level Physics Tuition – Kinetic Model of Matter Common Misconception

Misconception 1

Gases are compressible because their particles are soft and flexible but solids are incompressible because their particles are hard and inflexible.

Correct Conception 1

In the kinetic theory of matter, we assume the particles are hard and have a fixed shape, even for gases. Gases are compressed purely by reducing the space between their particles, but the volume of each particle does not change

Misconception 2.

In the Brownian motion experiment,  we can see air particles colliding with the smoke particles

Correct Conception 2

In the Brownian motion experiment, we cannot see air particles. We conclude that air particles collide with 

the smoke particles from the haphazard motion of the smoke particles.

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