Question 21
Change of State and VapoursWhich of the following is common to evaporation and boiling? They
- A.take place at any temperature
- B.are surface phenomena
- C.involve change of state
- D.take place at a definite pressure.
Show the answer and explanation
Answer: C (involve change of state)
Explanation
Both turn liquid into vapour, so both are changes of state. Evaporation happens at any temperature at the surface; boiling happens throughout at one temperature.