What happens to the temperature of boiling water once it's boiling point is reached
Answers
When boiling occurs, the more energetic molecules change to a gas, spread out, and form bubbles. These rise to the surface and enter the atmosphere. It requires energy to change from a liquid to a gas. In addition, gas molecules leaving the liquid take away heat energy. Therefore the temperature of the liquid remains constant during boiling. For example, water will remain at 100ºC while boiling. A graph of temperature vs. time for water changing from a liquid to a gas, called a heating curve, shows a constant temperature as long as water is boiling.
When boiling water reaches its boiling point, its temperature remains constant for some time before it starts increasing.
What happens when water boils?
- The water's boiling point is 100° C. When it heats up to 100° C, its temperature remains constant for a while.
- This is so because, at 100° C, water is absorbing the latent heat of vaporization.
- After some time, the boiling water starts getting converted to steam, and its temperature increases.
What is the latent heat of vaporization?
- Latent heat of vaporization of water is the additional energy it needs to change its state from liquid to gas.
- At 100° C, the temperature of boiling water remains constant because it is absorbing latent heat.
- The latent heat of vaporization is given by :
Q=mL
where m is the mass of liquid taken
and L is the specific latent heat of the liquid
- For water, L = 540 cal/g
- Once enough energy is absorbed to change its state, water converts into steam.
Thus, the temperature of boiling water is constant for a while once its boiling point is reached.