Question

a liquid boils at boiling point why​

Answer 1

Answer:

as a liquid is heated the average kinetic energy of it's particles increases. The rate of evaporation increases as more and more molecules are able to escape the liquid's surface into the vapour phase

Answer 2

Boiling. As a liquid is heated, its vapor pressure increases until the vapor pressure equals the pressure of the gas above it. ... In order to form vapor, the molecules of the liquid must overcome the forces of attraction between them. The temperature of a boiling liquid remains constant, even when more heat is added.