Temperature
What instrument measures temperature?
Thermometer
You drink hot coffee. Is the coffee hotter or colder than the room when you first drink it?
Usually hotter.
Heat is energy transferred because of a difference in what?
Temperature
True or False: A thermometer is used to measure temperature.
True.
Which is hotter: 80°C or 30°C?
80°C
Why does an ice cube become smaller when placed in a warm drink?
It absorbs heat from the warmer drink and melts.
If you hold a hot cup, does heat generally move from your hand to the cup or from the cup to your hand?
From the hot cup to your hand.
Which has the higher temperature: boiling water or ice?
Boiling water.
What is the temperature difference between 80°C and 30°C?
50°C
You take a cold bottle of water out of the refrigerator and leave it in a warm room. After some time, it becomes less cold. Why?
Heat transfers from the warmer surroundings to the colder bottle/water.
An ice cube is placed in a glass of warm juice. In which direction does heat generally transfer?
From the warmer juice to the colder ice.
You put one ice cube in a glass of water and another ice cube in a glass of warm water. Which ice cube will melt faster?
The one in the warm water.
You have two cups of water. Cup A is 70°C and Cup B is 20°C. Which cup has the higher temperature, and by how many degrees?
Answer: Cup A; 50°C higher.
Why does a thermos help keep a hot drink hot for a longer time?
It is designed to reduce heat transfer between the drink and its surroundings.
A metal spoon is placed in a cup of hot coffee. After several minutes, the handle becomes warm. What happened?
Heat was transferred from the hot coffee through the spoon toward the cooler handle.
You have a cup of hot water and a cup of cold water. You leave both in the same room for a very long time. What do you expect their temperatures to eventually do?
They will move toward the temperature of the surroundings.
A cup of hot coffee is left on a table in a cooler room. What will generally happen to its temperature over time?
Its temperature will decrease and approach the temperature of the surroundings.
You touch a metal chair and a wooden chair that have been in the same room for hours. The metal chair feels colder. Does this necessarily mean the metal chair has a lower temperature?
No. They can be at nearly the same temperature; metal conducts heat away from your hand more quickly, making it feel colder.
True or False: Heat naturally transfers from a colder object to a hotter object.
False. Heat naturally transfers from higher temperature to lower temperature.
"Heat and temperature are the same thing because both tell us whether something is hot or cold." Is the statement correct?
No. Heat and temperature are related but are not the same thing. Temperature describes how hot or cold something is, while heat is energy transferred because of a temperature difference.