Why prepare a cup of tea with boiling water

The instructions printed on the side of a tea packet say, To make a perfect cup of tea, add boiling water to the tea bag and leave for a minute . The stipulation for one minute suggests the criterion for brewing tea in water at 100 °C is a kinetic requirement. In fact, it reflects the rate at which flavour is extracted from the tea bag and enters the water. 

Remember that the temperature of boiling water 7 (b0ii) is itself a function of the external pressure, according to the Clausius-Clapeyron equation (see Section 5.3). 

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