Question

in pressure cooker water boils at T°C ; T is ---------<br /><br />a) 100°C<br />b) T > 100°C <br />c) T < 100°C<br />d) none of these ....<br /><br />which one will be the correct answer please tell me quick ...<br /><br />plz follow me and I will follow you back ....​

Answer 1

Answer:

B

Explanation:

The boiling point of water varies with pressure. It is 100 °C only at a pressure we have chosen to use as a standard, originally 760 mm of mercury on a barometer (chosen to be a round figure within the range of pressures normally experienced at sea level). In the SI system this works out as 1.01325 bar. (This is why meteorologists today talk about pressures in millibar, e.g. 1013 mbar.) If we were starting today, we would have set the pressure as 1.000 bar, and 100 °C would be what is now 99.63 °C.

As a chemical engineer, I use what are called the steam tables, actually data on the boiling point of water (and a lot of other information) versus pressure.

These tell me that at a boiling point of 120 °C occurs at a pressure of 2 bar. Thus I conclude that pressure cookers operate at about twice atmospheric pressure