Types of Heat Transfer

There are three types of heat transfer. They are conduction, convection, and radiation. Here are some examples of heat transfer: 

Conduction

Conduction is when you touch something directly. For instance if you touch a hot iron bar without an oven mitt, the heat from the bar transfers into your hand.

Some examples are: touching a hot pan, holding a hot rock, touching a metal ladle that is in a pot of hot liquid

Convection

Convection is heat from a liquid or gas. If you take the lid off of a boiling pot and put your face over it, the heat from the steam will go into your face. Some other examples of convection are putting your leg into the swimming pool, feeling the warm breeze on a summer day, and sticking your hands out to the air vents to warm up on cold days.

Radiation

Radiation is heat that is radiated by light. Light bulbs, the sun, a popcorn maker, floresant lights from a mall, and fire are all forms of radiation.

<--The sun is radiating heat on to him.

Hot is Cold

In the world of heat, even the coldest objects have heat. Sometimes cold objects have more heat energy than warmer things. In such an instance, a -20 degrees Celsius iceberg had more heat energy than a 50 degrees Celsius cup of tea. This is because the iceberg has more mass that the cup of tea and more mass means more heat energy.

Conduction at it's coldest

As you know conduction is heat transfer by touch. You probably don't know that heat transfer can also be cold: if you touch an iceberg the heat from your hand will go into the iceberg and therefor, your hand will turn cold.

Convection at it's coldest

Convection can be cold, yes cold. It is obvious because of a cool gust of wind or a snowy breeze can make you cold. That cool gust of wind or snowy breeze is cooler than your face, so when it blows across your face, heat from your face will transfer to the wind and will leave your face cold.