Which of the following is the example of free convection?
A microwave oven cooking a meal.
Can heat be transferred by convection?
When a fluid, such as air or a liquid, is heated and then travels away from the source, it carries the thermal energy along. This type of heat transfer is called convection. The fluid above a hot surface expands, becomes less dense, and rises. A space heater is a classic convection example.
Is boiling water convection?
On Earth, water boils via natural convection. The water molecules in your pot continually exchange in this way, thanks to gravity, eventually warming the entire pot of liquid. This is known as natural convection—the movement of molecules through fluid—which is a primary method of heat (and mass) transfer.
Is boiling an egg conduction or convection?
Boiling of an egg is not an example of convection. It is an example of conduction. As the heat is conducted from the boiling water to the egg.
What happens to the cooler water in convection?
Heating a pot of water on a stove is a good example of the transfer of heat by convection. At the same time, the cooler, more dense water at the top will sink to the bottom, where it is subsequently heated. These convection currents are illustrated in the following figure.
Is walking on the hot sand on a beach conduction convection or radiation?
Conduction occurs as a flow of kinetic energy from one molecule to the next by direct contact. When you are lying on the beach it occurs between you and the surface that you are lying on. When you first lie down on hot sand, then the energy flows from the hot sand to your cooler body by conduction.
Why do your feet burn when you walk across beach sand on a sunny summer day?
Why do your feet burn when you walk across beach sand on a sunny summer day? Heat is transferred by thermal conduction.
Is chocolate melting in your hand conduction convection or radiation?
Heat Transfer
| A | B |
|---|---|
| Radiation | Cooking popcorn in the microwave. |
| Conduction | Using a heating pad on sore muscles. |
| Conduction | A metal spoon that gets warm from hot soup. |
| Conduction | Chocolate melting in your hand. |
How do you know when the transfer of heat has ended?
How do you know when the transfer of thermal energy has ended? Thermal energy never stops transferring. When one substance begins to boil. When you can measure the amount of heat.
What is the transfer of heat by movement of liquids or gases?
Convection
What type of heat transfer is happening when the sun warms your face?
Review for Heat Transfer Quiz
| A | B |
|---|---|
| Radiation | The direct transfer of energy by electromagnetic waves. |
| Conduction | The direct transfer of heat between two touching things. |
| Convection | The transfer of heat by the movement of a fluid. |
| Feeling the sun’s heat on your face is an example of which kind of heat transfer? | Radiation |
Which of the following is an example of heat transfer by conduction?
If you leave a metal spoon propped up in a pot, it will become hot from the boiling water inside the pot. Chocolate candy in your hand will eventually melt as heat is conducted from your hand to the chocolate. When ironing a piece of clothing, the iron is hot and the heat is transferred to the clothing.