What is the temperature difference between the lower and upper fixed points of water on the Fahrenheit (∘F^{\circ}\text{F}∘F) temperature scale?
100 ∘F100\ ^{\circ}\text{F}100 ∘F
180 ∘F180\ ^{\circ}\text{F}180 ∘F
212 ∘F212\ ^{\circ}\text{F}212 ∘F
273 ∘F273\ ^{\circ}\text{F}273 ∘F
313 exam-style questions on CIE IGCSE Physics 2.2.3a Melting, boiling, condensation and solidification. Each one has a worked solution and a mark scheme showing where the marks go.