name two fluid technologies that make use of water

Refrigerator : There are 5 basic components in refrigeration I.e. fluid refrigerant, a compressor which controls the flow of refrigerant; the condensor coil( on the outside of the fridge), evaporation coils( on the inside of the fridge) and something calls an expansion device.

The compressor constricts the refrigerant vapour,raising its pressure and pushes it in the coils on the outside of the refrigerator.
When the hot gas in the coils meets the cooler air temperature of the kitchen it becomes a liquid.
Now in the liquid form at high pressure, the refrigerant cools down as it flows into the coils inside the freezer and the fridge.
The refrigerant absorbs the heat inside the fridge cooling down the air.
Last the refrigerant evaporates to a gas then flows back to the compressor where the cycle starts all over.

Fire Extinguishers: Water performs two functions; its conversion tosteam absorbs the heat, and the steam displaces the air from the vicinity of the flame. Many siimple fire extinguishers are quipped with hand pumps or sources of compressed gas to propel water through the nozzle.