The Kelvin temperature is 270K. What is the corresponding Celsius scale temperature?

When a beam of sunlight enters a room through a window, we can see tiny particles X suspended in a gas (or rather a mixture of gases) Y which are moving rapidly in a very haphazard manner.

(a) What could particles X be?

(b) Name the gas (or mixture of gases) Y.

(c) What is the phenomenon exhibited by particles X known as?

(d) What is causing the movement of particles X?

(e) What conclusion does the existence of this phenomenon give us about the nature of matter?

The boiling point of water is 100°C. Express this in SI units (Kelvinscale).

Convert the temperature of 573K to the Celsius scale.

Convert the temperature of 373°C to the Kelvin scale.