Match each type of heat transfer with the example describing it

(1) Conduction

(2) Free Convection

(3) Forced Convection

(4) Evaporation

(5) Radiation

Possible Answers:

(A) A bear stands in a cold flowing stream and loses heat to the water.

(B) A seagull stands on ice and loses heat through its feet.

(C) A lizard absorbs heat from the sun's rays.

(D) An athlete sweats while running a race.

(E) A dog stands outside on a cold, but windless, day and loses heat to the air.

Conduction - B

Free Convection - E

Forced Convection - A

Evaporation - D

Radiation - C

Explanation:

Other examples could be

1 contuction: Touching a stove and being burned.

Remember: Conduction occurs when two object at different temperatures are in contact with each other. Heat flows from the warmer to the cooler object until they are both at the same temperature. Conduction is the movement of heat through a substance by the collision of molecules.

2 Free convection: Boiling water - The heat passes from the burner into the pot, heating the water at the bottom. Then, this hot water rises and cooler water moves down to replace it, causing a circular motion.

Remember: Natural convection, known also as free convection is a mechanism, or type of mass and heat transport, in which the fluid motion is generated only by density differences in the fluid occurring due to temperature gradients, not by any external source (like a pump, fan, suction device, etc.).

3 Forced cinvection: using a fan on a hot summer day

Remember Forced convection is a special type of heat transfer in which fluids are forced to move, in order to increase the heat transfer. This forcing can be done with a ceiling fan, a pump, suction device, or other.

4 Evaporation: Drying Clothes under The Sun.

Remember: Evaporation is a type of vaporization that occurs on the surface of a liquid as it changes into the gas phase

5 Radiation: alpha particles emitted from the radioactive decay of uranium.

Remember: Radiation is a method of heat transfer that does not rely upon any contact between the heat source and the heated object as is the case with conduction and convection. Heat can be transmitted through empty space by thermal radiation often called infrared radiation.

(1) Conduction - (B) A seagull stands on ice and loses heat through its feet.

heat is lost due to direct contact.

(2) Free Convection - (E) A dog stands outside on a cold, but windless, day and loses heat to the air. There is heat transfer due to difference in temperatures.

(3) Forced Convection - (A) A bear stands in a cold flowing stream and loses heat to the water. Here we consider buoyancy effects.

(4) Evaporation - An athlete sweats while running a race. water turns evaporates from the body taking a away heat.

(5) Radiation - (C) A lizard absorbs heat from the sun's rays. Sun's heat travels as radiation.