To improve thermal insulation in the thermos flask between the double glass walls, the gas is at such a low pressure that the free path of the molecules is significantly greater than the distance between the walls of the flask. Estimate the gas pressure in the flask of a thermos if it is known that 1 kg of hot water in it cools from 100°C to 94°C in 1 hour. There is helium between the walls of the flask.
Detailed solution. Format jpg
No feedback yet