Heat II
What is a thermometer used to measure?
Temperature
Which of these is a good conductor of heat: rubber, plastic, metal, or wood?
Metal
Which material is a poor conductor of heat and is often used to keep things cool?
plastic
What has hands but cannot clap?
clock
What is the primary source of heat energy on Earth?
sun
What happens to a solid object when it gains heat?
It expands
Ask this question all day long, but always get completely different answers, and yet all the answers will be correct. What is the question?
What time is it?
Why do some cooks use a wooden spoon to stir hot soup instead of a metal one?
A. Wood is heavier and easier to hold.
B. Wood is a poor conductor of heat, so it won't burn their hand.
C. Wood transfers heat faster than metal.
D. The soup tastes better when stirred with wood.
B. Wood is a poor conductor of heat, so it won't burn their hand.
Explain why a metal spoon feels hot when left in hot soup, but a wooden spoon does not.
metal spoon is good conductor while wooden spoon is poor conductor
What has many rings but no fingers?
Phone
true or false : The handle of a metal cooking pot is made of metal because it is a good conductor of heat.
False. The handle of a cooking pot is made of a poor conductor (like plastic or wood) so that it does not get too hot to touch.
It has keys, but no locks. It has space, but no room. You can enter, but can’t go inside. What is it?
keyboard
David's father has three sons: Snap, Crackle and _____?
David
Write "True" or "False" for each statement.
Heat always moves from a cooler place to a hotter place.
False. Heat always flows from a hotter region to a cooler region
Name two artificial (man-made) sources of heat
iron, heater
Why do people wear thick woolen sweaters in cold weather?
The woolen sweater is an insulator that traps a layer of warm air close to the body. This prevents the body's heat from escaping, keeping the person warm.
What is the difference between heat and temperature?
Heat is a form of energy that transfers between objects, while temperature is a measure of how hot or cold something is, indicating the average motion of its particles.
Why does a metal spoon placed in a cup of hot soup become hot, while the soup itself gets cooler?
Rita left her ice cream in a bowl outside on a warm day. The ice cream melted. Did the ice cream gain or lose heat to cause it to melt? Explain your answer.
The ice cream gained heat from the warm environment. When a substance absorbs heat, its temperature increases, which in this case caused the ice cream to change from a solid to a liquidWhat is metals.
A mug of hot coffee at 80°C is placed on a table.
After 15 minutes, the temperature of the coffee in Mug A is 50°C, and the temperature in Mug B is 70°C. Explain the difference in temperature change between the two mugs.
Mug A cooled down faster than Mug B because it is made of ceramic, which is a better conductor of heat than the air or vacuum and plastic in Mug B. This allows heat to escape more easily from the coffee in Mug A to the surroundings. Mug B has layers of poor heat conductors (vacuum and plastic lid), so less heat is lost from the coffee to the surroundings.