$(a)$ Explain the effect of temperature on the movement of particles of matter.
$(b)$ Give a reason why we get the smell of hot sizzling food even when we are metres away from it?

(N/A) Effect of temperature: As the temperature increases,the kinetic energy $(KE)$ of the particles of matter increases. This causes the particles to move more rapidly.
$(b)$ Hot sizzling food releases vapours. At high temperatures,the kinetic energy of these vapour particles is very high,causing them to move faster and diffuse into the air over a large distance. This process of diffusion allows the smell to reach us even when we are several metres away.