Physics
Water will not be vapourised if

The temperature is 100°C
The humidity is 0%
The humidity is 100%
The temperature is 0°C

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Physics
In the gamma decay of a nucleus

Neither the mass number nor the atomic number of the nucleus changes
The mass number of the nucleus does not change whereas its atomic number changes
Both the mass number and the atomic number of the nucleus change
The mass number of the nucleus changes whereas its atomic number does not change

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