Experiment 9 — From Ice to Steam

Topic: Chemistry · Class 9 · Matter in our surroundings: states and latent heat

Aim: Heat the ice all the way to steam and explain the two flat parts of the graph.

Daily: This is why ice in a glass keeps your drink cold long after it should have warmed, and why steam scalds so much worse than boiling water — the hidden heat.

Question: While ice is melting, heat keeps flowing in. What happens to the temperature?

Exp: The energy goes into breaking the bonds between particles, not into raising temperature. That is latent heat.

Question: The heat absorbed while a solid melts at constant temperature is the latent heat of…

Exp: For ice it is about 334 kJ/kg.

Question: Steam at 100 °C burns worse than water at 100 °C because…

Exp: About 2,260 kJ per kg is released.

Question: Evaporation differs from boiling in that it…

Question: Water in an earthen pot stays cool because…

Exp: Evaporation causes cooling.