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प्रश्न
Why are we able to sip hot tea or milk faster from a saucer than a cup?
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उत्तर
- A liquid has a larger surface area in a saucer than in a cup. Thus, it evaporates faster and cools faster in a saucer than in a cup.
- For this reason, we can sip hot tea or milk faster from a saucer than from a cup.
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संबंधित प्रश्न
Define the following terms Condensation
Why does all the water of the earth not get evaporated during hot summer days ?
How will you demonstrate that water vapour is present in air ?
Which of the following are also considered to be the states of matter ?
- Plasma
- Platelets
- BEC
- BHC
The scientists now say that there are actually five states of matter A, B, C, D and E. The state A has a fixed volume but no fixed shape. The state B can be compressed very easily by applying pressure and state C has a fixed shape as well as a fixed volume. The state D is a mixture of free electrons and ions whereas state E is named after an Indian scientist and a famous physicist.
- Name the physical states (i) A (ii) B (iii) C (iv) D, and (v) E
- Name one substance belonging to state C which can directly change into vapours on heating. What is this process known as ?
- Name one substance which normally belongs to state B but whose solid form changes directly into gaseous state.
- Name the most common substance belonging to state A.
- Which state of matter makes the sun and other stars to glow ?
The amount of vapour in 1 cu.m. of air shows the ______.
How is humidity measured?
How does the water kept in an earthen pot remain cool?
When lemon juice is mixed with soda water, they produce brisk effervescence.
The process of evaporation is not a good technic to separate salt from seawater give a reason.
