&Dt_start=Let's see what happens with the refrigerant when we lower the pressure...
Click the "Play" button again...
&Dt_boil=The refrigerant starts to boil, using energy in the form of heat from the surroundings...
Click the "Play" to move on...
&Dt_cool=Taking away heat from the surroundings means cooling the surroundings...
Click the "Play" to move on...
