What is heat?
1) Heat is a form of energy.
2) It flows from a hotter to a colder place.
3) Heat causes the temperature of an object to change.
What is temperature?
1) Temperature is a property of an object.
2) Temperature is a measure of how hot or cold an object is.
Which one depends on the amount of substance: heat or temperature?
Heat.
What tool is used to record temperature digitally?
Heat sensor and data logger.
What happens to temperature when heat is added?
It increases.
What happens to temperature when heat is lost?
It decreases.
What direction does heat flow in?
From a hotter object to a colder one.
What is melting?
A solid changing to a liquid (heat gain).
What is freezing?
A liquid changing to a solid (heat loss).
What is boiling?
A liquid changing to a gas (heat gain).
What is condensation?
A gas changing to a liquid (heat loss).
What are the 3 states of matter?
Solid, liquid, and gas.
Why can a giant iceberg have more heat than a cup of hot coffee?
Because it has much more mass (more substance = more heat).
What happens when a substance gains heat?
It expands.
What happens when a substance loses heat?
It contracts.
What is thermal expansion?
When matter increases in size (length, volume) due to heat gain.
What is thermal contraction?
When matter decreases in size due to heat loss.
What happens to solids when heated and cooled?
Solids expand when heated and contract when cooled.
What happens to liquids when heated and cooled?
Liquids expand when heated and contract when cooled.
What happens to gases when heated and cooled?
Gases expand when heated and contract when cooled.
Why do railway tracks have gaps?
To allow room for expansion during hot weather.
Why do glass jars sometimes crack with hot water?
Uneven expansion of thick glass due to poor heat conductivity.
How does a bimetallic strip work?
Different metals expand at different rates, causing the strip to bend.
What helps a hot air balloon rise?
Air inside it expands when heated, making it lighter than outside air.
