Why does a balloon filled with helium gas get smaller when the temperature changes from $30\,^{\circ}\text{C}$ to $10\,^{\circ}\text{C}$?
- AThe gas condenses to a liquid and so takes up less space.
- BThe gas particles become smaller at lower temperatures.
- CThe gas particles diffuse through the balloon and escape.
- DThe gas particles move more slowly so reducing the pressure.