around at a good clip to promote faster, more even cooking Similarly, agitating the oil when deep frying can lead to foods that crisp and brown more efficiently Here are some examples of heat transfer through convection: • Steaming asparagus stalks • Boiling dumplings in stock • Deep-frying onion rings • Barbecuing a pork shoulder • The top of a pizza baking in an oven Dumplings boiling—heat through convection Radiation is transfer of energy through space via electromagnetic waves Don’t worry, that’s not as scary as it sounds It doesn’t require any medium to transfer it It is the heat you’re feeling when you sit close to a fire or hold your hand above a preheated pan The sun’s energy travels to the earth through the vacuum of space Without radiation, our planet (and indeed, the universe) would be in a lot of trouble! An important fact to remember about radiant energy is that it decays (that is, gets weaker) by the inverse square law —the energy that reaches an object from a radiant energy source is proportional to the inverse of the square of its distance For example, try holding your hand foot away from a fire, then move it feet away Even though you’ve only doubled the distance, the fire will feel only about onequarter as hot Here are some examples of radiant heat transfer: • Roasting a pig on a spit next to hot coals • Toasting garlic bread under the broiler • Getting a tan from the sun • Broiling some marinated salmon ... heat you’re feeling when you sit close to a fire or hold your hand above a preheated pan The sun’s energy travels to the earth through the vacuum of space Without radiation, our planet (and indeed, the universe) would be in a lot of trouble! An... energy is that it decays (that is, gets weaker) by the inverse square law ? ?the energy that reaches an object from a radiant energy source is proportional to the inverse of the square of its distance... distance For example, try holding your hand foot away from a fire, then move it feet away Even though you’ve only doubled the distance, the fire will feel only about onequarter as hot Here are some examples of radiant heat transfer: