Heat and Temperature
What is the SI unit of heat?
Joule (J)
How do gases expand when heated?
Gases expand because their molecules move faster and spread apart.
Can a thermometer be used to measure the temperature of the air in a room?
Yes, a thermometer can measure air temperature in Celsius or Fahrenheit.
How does the size of an object affect its heat capacity?
Larger objects have a higher heat capacity.
What is the unit of power?
Watt (W).
What is the difference between heat and temperature?
Heat is the total energy transferred between bodies due to temperature difference (measured in joules).
Temperature is a measure of how hot or cold something is (measured in °C or K).
What happens to the length of a metal rod when it is heated?
When a metal rod is heated, it expands and its length increases.
What tool do you use to measure the temperature of water?
A thermometer in Celsius (°C) or Kelvin (K).
What is heat capacity?
Heat capacity is the amount of heat needed to change the temperature of an object by 1°C.
What is the unit of work?
Joule (J).
Does heat flow from cold to hot or from hot to cold?
Heat always flows from hot to cold.
What is thermal expansion?
When an object gets larger without gaining any matter is called expansion.
What does a thermostat control?
A thermostat controls the temperature in a room or appliance (like a heater or air conditioner).
What is the formula to calculate the heat energy required to change the temperature of a substance?
Q=mcΔT
What is the unit of force?
Newton (N).
What is the SI unit of temperature?
Kelvin (K)
What happens to the volume of a liquid when it is heated?
The volume of a liquid increases as the particles move faster and spread out.
How can you measure the temperature of the air outside?
Use a thermometer in Celsius (°C).
What is the unit of specific heat capacity?
Joules per gram per degree Celsius (J/g°C).
What is the unit of pressure?
Pascal (Pa).
What instrument is used to measure temperature?
A thermometer.
How does the expansion of gases differ from that of solids and liquids?
Gases expand the most, liquids less, and solids expand the least.
What is a thermometer used for?
A thermometer is used to measure temperature.
What does it mean if a substance has a low specific heat capacity?
It heats up quickly with little heat input.
What is the formula for calculating work?
W=F×d
W=work
F=force
d=distance