Sangeetha Pulapaka

Yes, they do. Also, the older the appliance the more heat is generated, also more electricity is used in this process.

Refrigerant is the working fluid used in refrigerators. Common refrigerants are ammonia, carbon dioxide, methyl chloride, flourocarbons. These chemicals damage the ozone layer and hence they are being replaced. Air conditioners also use refrigerants. To remove chlorine from the refrigerant, manufacturers created another set of refrigerants called HFCs (or Hydro Fluro Carbons). Although they also have the potential for global warming, but still they are better than HCFCs as they do not deplete the ozone layer. The most common HFC used in air conditioners is R-410A.

Here is one trick to avoid the over usage of air conditioners

. Fill a mixing bowl with ice (or something equally cold, like an ice pack), and position it at an angle in front of a large fan so the air whips off the ice in an extra-chilled, extra-misty state. It's magic!

It looks like Einstein did his best not only in quantum physics, but also in classic, immediately-helpful science. Back in the 1930’s, helped by his friend Leo Szilard, he invented a non-electric refrigerator. Scientists from Oxford are struggling to revive his invention today

Modern refrigerators are working on the principle on contraction and expansion of the freon. We all have freon in our refrigerators. It’s a synthesized gas, causing greenhouse effects worse than CO2. It’s said that the Einstein refrigerator is one of the most mportant invention of the 20th century, since it stopped the spread of infectious diseases caused by rotten food – worldwide. So there are more and more refrigerators being used, then dumped, and their freon going into the upper layers of the atmosphere, causing greenhouse effects.

The main principle behind Einstein’s refrigerator is that the water boils at lower temperatures when the surrounding air pressure is lower. For example, if you go on a mountain, you’ll see the difference between the boiling point from there and the boiling point from your home (or the sea altitude). If you live on a mountain, then you’re lucky – you’ll boil your eggs faster in the morning.