A light bulb. The input energy is 10 Joules. The useful output energy is light 4 Joules and
the wasted energy is heat 6 Joules.

Zeros that follow non-zeros numbers and are also to the right of a decimal point are significant

Ammonia enters the expansion valve of a refrigeration system at a pressure of 10 bar and a temperature of 18oc and exits at 6.0 bar. the refrigerant undergoes a throttling process. determine the temperature, in oc, and the quality of the refrigerant at the exit of the expansion valve.

In a good thermo flask the main cause of heat loss is