Question

Give reason: The level of liquid is seen to fall first and then rise in a long narrow necked flask when heated​

Answer 1

Answer:

latent heat

Explanation:

the temperature to boil is 100 but it need a constant more heat to convert to steam

Answer 2

Answer:

$when \: a \: liquid \: is \: heated \: the \\ molecules \: is \: composed \: of \: \\ higher \: kinetic \: energy.this \: \\ would \: mean \: that \: they \: would \: \\ occupy \: more \: place \: and \: hence \: \\ liquid \: rises.$