State one effect of pressure on the: (i) freezing point of a liquid; (ii) boiling point of a liquid.

For most substances, increasing pressure raises the freezing point. However, for water, increasing pressure lowers the freezing point.

Increasing pressure raises the boiling point of a liquid.

Mass of hot water ($m_h$) = Rate of hot water $\times$ Time

Mass of cold water ($m_c$) = Rate of cold water $\times$ Time

True Celsius scale:
Lower Fixed Point ($LFP_t$) = $0 \text{ °C}$
Upper Fixed Point ($UFP_t$) = $100 \text{ °C}$
Range = $100 - 0 = 100 \text{ °C}$

Faulty thermometer:
Lower Fixed Point ($LFP_f$) = $0.5 \text{ °C}$
Upper Fixed Point ($UFP_f$) = $90 \text{ °C}$
Range = $90 - 0.5 = 89.5 \text{ °C}$