Heating Curve of Water

Also called

heating curve · temperature time graph · change of state · latent heat · latent heat of fusion · latent heat of vaporisation · melting point · boiling point · melting of ice · boiling of water · specific heat capacity · plateau · phase change · steam · गुप्त ऊष्मा · गलनांक · क्वथनांक

Topics

• Heated at a steady rate, ice first warms from below 0 °C until it begins to melt at 0 °C.
• While ice melts the temperature stays at 0 °C: the latent heat of fusion (about 334 J/g) goes into melting.
• Once all the ice has melted the water warms steadily from 0 °C to 100 °C.
• At 100 °C the water boils and the temperature stays fixed again until all of it has turned to steam.
• The latent heat of vaporisation (about 2256 J/g) is nearly 7 times that of fusion: the boiling plateau is longest.
• During a change of state the heat separates the molecules; it does not make them move faster.
• Temperature tracks the average kinetic energy of the molecules: they jiggle harder as it rises.
• Heat for a change of state is Q = mL; heat to warm one state is Q = mcΔT. Ice and steam warm twice as fast as water.
• At normal pressure water melts at 0 °C and boils at 100 °C; at higher pressure it boils at a higher temperature.

About this model

A GLB file of about 492 KB, shown in Lably's 3D viewer and, on a phone, placed in your room with AR. Credit: Model, science and animation: Lably (built procedurally with three.js; no downloaded meshes). | CC BY 4.0. Original geometry and animation made for Lably.

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