Heat Transfer Scenes
1. Steaming Hot Chocolate
The hot chocolate is at a higher
temperature than the surrounding air and
mug. Heat is transferred from the hot
chocolate to the mug and cooler air above
the hot chocolate. We see “steam” (tiny
water droplets suspended in air) above the
top of the mug because the hot chocolate
warms the moisture filled air above the mug
and causes the water in the air to condense
into tiny droplets that we can see as
“steam.”
2. Hot soup with metal spoon
The hot soup is at a higher temperature than the metal spoon. Heat is transferred
from the soup to the metal spoon through direct contact.
3. Boiling water
The pot becomes hot from touching the heat element. In turn, heat is transferred from
the pot to the water that is touching the sides of the pot. As the water heats, hot water
rises and cold water sinks. As that water gets hotter, it rises. And the cycle continues.
4. Woodstove
Heat from a woodstove is
transferred in two ways. The
fire heats the woodstove. The
woodstove becomes hot. The
air touching the woodstove is
heated. As the air warms, it
rises. The cooler air sinks. Heat
waves from the metal on the
stove also help warm the room.
5. Mirage
Heat from the Sun warms the black asphalt. The air molecules directly above the
asphalt are become much hotter than the surrounding cooler air. A wavy and often
duplicate image appears because light bends when it passes from one medium to
another; in this case, from warmer air to cooler air.
6. Woman Peeking in Oven
In the oven, hot air rises and cold air sinks. The
cold air heats up, it rises and the cycle counties.
Heat is transferred to items placed in an oven
through this cycle. Heat is also emitted from
the hot walls of the oven.
7. Ice cream melting in Sun
Heat from the Sun is transferred to
the lower heat ice cream, causing the
ice cream to melt. The heat waves
warm up the ice cream.
8. Heat lamp
The heat from the lamp warms the air molecules, similar to the melting ice cream
example.
Heat Transfer Scenes
1. Steaming hot chocolate
a. Conduction
b. Convection
c. Radiation
2. Hot soup with metal spoon
a. Conduction
b. Convection
c. Radiation
3. Boiling Water (Two or more answers)
a. Conduction
b. Convection
c. Radiation
4. Woodstove (Two or more answers)
a. Conduction
b. Convection
c. Radiation
5. Mirage (Two or more answers)
a. Conduction
b. Convection
c. Radiation
6. Woman peeking in oven (Two or more answers)
a. Conduction
b. Convection
c. Radiation
7. Ice cream melting in the Sun.
a. Conduction
b. Convection
c. Radiation
8. Heat lamps
a. Conduction
b. Convection
c. Radiation
Heat Transfer Sciences – Key
1. Steaming Hot Chocolate – B. Convection
2. Hot soup with metal spoon – A. Conduction
3. Boiling water – A. Conduction, B. Convection
4. Woodstove – A. Conduction, B. Convection, C. Radiation.
5. Mirage – B. Convection, C. Radiation
6. Woman Peeking in Oven – B. Convection, C. Radiation
7. Ice cream melting in the Sun – C. Radiation
8. Heat Lamps – C. Radiation
Heat Transfer Scenes – Scoring Guide
1. B (3 choices)
2. A (3 choices)
3. A, B (3 choices)
4. A, B, C (3 choices)
5. B, C (3 choices)
6. B, C (3 choices)
7. C (3 choices)
8. C (3 choices)
Scoring Guide
8–4
6-7 – 3.5
5–3
4–2
3–1
1-2 – .5
0–0