The fridge works by process of evaporation, by compressing and depressurising the air, thus creating the cool air, which is why our fridges tend to hum. The gas refrigerant goes into the compressor and the process of compression makes the gas hot. The hot gas condenses into a liquid when it meets the cooler air in the kitchen. The liquid is then pushed through the very small opening of the valve and it absorbs the heat inside the fridge, making it evaporate into a gas. The gas then goes back into the compressor and the whole process starts again.
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†Source Euromonitor International Limited; Consumer Appliances 2019 ed, as per major appliances definition, retail volume sales in units, 2018 data