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Explain the following
In winter, water tanks (or ocean) start freezing from the surface and not from the bottom.
Two bodies are at same temperature. Do they necessarily contain same amount of heat?
Define coefficient of linear expansion.
A small gap is left between two iron rails of the railway track. Why?
State three main characteristics of a thermometric substance.
Give a scientific reason for the following:
In winter the birds fluff up their feathers.
When a window is accidentally left open on a winter night, will you feel uncomfortable because the cold is getting in, or because the heat is escaping from the room?
Temperature is related to how fast the atoms within a substance are moving.
Match the following:
| Column-I | Column-II | |
| 1. | Length | s |
| 2. | Mass | m |
| 3. | Time | k |
| 4. | Temperature | kg |
What do you mean by thermal equilibrium?
