Your own Heating Device
What you will need:
 Large zip lock bag – 1
 Small zip lock bag – 1
 Paper cup – 1
 Pre-cooked instant porridge or oatmeal (freshly cooked)
 Sheets of newspaper – 3
 Sheets of aluminum foil – 3
 Thermometer
Method:
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Take the porridge oatmeal in the paper cup.
Measure the temperature of the oatmeal using the thermometer.
Take the cup and seal it inside the small zip-lock bag.
Fill the large zip-lock bag with newspaper or aluminum foil. (It’s your choice.)
Put the small bag into the larger one and seal it.
Measure the temperature of the oatmeal using the thermometer.
Repeat the experiment with the material you didn’t choose the first time.
How it actually happens!
Heat is lost in three ways: conduction, convection and radiation.
Aluminum is a good conductor of heat and hence, it will gain heat from the food and loose it to the
surrounding due to convection. (This is why your oatmeal will cool down a little bit)
At the same, aluminum is a good reflector of radiation energy, which prevents direct convection loss
keeping the heat preserved and your food warm.
What works best? If you wrap using the foil and over that with newspaper! Less conduction takes place!