Warm the North Sea
Warm the East coast of the UK - for free We use 1950s technology - the heat pump. We extend a low pressure gas down into the stainless steel helix in the seas. When there half the pressure on a gas, the absolute temperature halves. So the gas there was at 30° C, at two scales according to the absolute temperature. Which is Celsius plus 273. That the entry temperature b T₁, and the exit temperature T₂. It is important that the gas is dry. So free receiving a draw in air through a dry salt. Which removes the water vapour. The temperature multiplier by the pressure is the gas constant, you do not really have to know the value! 1 (T₁+273)xP₁=2(T₂+273)x 1/2P₂ Which looks complicated! It means that (T₂+273)=2(T1+273) We are only doubling the pressure, so at an approximation T₂=T₁+300. So when we double the pressure on the gas, it heats up by 300° C. This is why a new plan for a bicycle tire, the valve gets really really hot!...