1. Tardigrade
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  3. Chemistry
  4. Assertion: The normal boiling point of water is 100 °C and standard boiling point of water is 99.6 °C. Reason: The temperature at which vapour pressure of liquid is equal to the external pressure is called boiling temperature at that pressure.

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Q. Assertion : The normal boiling point of water is $100 \,{}^{\circ}C$ and standard boiling point of water is $99.6 \,{}^{\circ}C$.
Reason: The temperature at which vapour pressure of liquid is equal to the external pressure is called boiling temperature at that pressure.

States of Matter

Solution:

At $1$ atm pressure, boiling temperature is called normal boiling point and if pressure is $1$ bar then the boiling point is called standard boiling point of the liquid. $1$ bar pressure is slightly less than $1$ atm pressure therefore, standard boiling point of the liquid is slightly lower than the normal boiling point.