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Level 27

Science-Temperature changes (English-Meaning)


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Degrees Celsius
A unit for measuring temperature.
Evaporate
When a liquid turns into a gas.
Internal energy
The energy stored in the movement of particles. Sometimes called thermal energy.
Joule
A unit for measuring energy.
Temperature
How hot something is, usually measured in degrees Celsius.
Thermal energy
Another term for internal energy.
Absorb
‘To soak up’ or ‘to take in’.
Conduction
The way energy is transferred through solids by heating.
Convection
The way energy is transferred by heating in fluids.
Convection current
A flow of liquid or gas caused by part of it being heated or cooled more than the rest.
Density
The amount of mass that one cubic centimetre of a substance has. Often measured in grams per cubic centimetre (g/cm3).
Emit
To give out.
Fluid
A gas or a liquid.
Infrared radiation
A way of transferring energy by heating that does not need a medium (material). Infrared radiation can travel through transparent things and a vacuum (empty space).
Medium
Any substance through which something travels.
Radiation
A way of transferring energy by heating. Also known as infrared radiation. Infrared radiation can travel through transparent things and a vacuum (empty space).
Reflect
To bounce off a surface instead of passing through it or being absorbed.
Thermal conductor
A material that allows internal (thermal) energy to be transferred through it easily.
Thermal imager
A device like a camera that makes images by detecting infrared radiation.
Thermal insulator
A material that does not allow internal (thermal) energy to be transferred through it easily.
Solar cell
A flat plate that uses energy transferred by the light to produce electricity.
Solar panel
A panel that uses energy from the Sun to heat water.
Accurate
A measurement that is close to the true value.
Precise
Measurements that are close to one another.
Random error
An error that can be different for every reading.
Systematic error
An error that is the same for all readings, such as when forgetting to zero a balance before using it to measure a series of masses.
Valid
Something is valid if it is doing what it is supposed to do. A measurement is valid if it measures what it is supposed to measure. A valid conclusion is drawn only from the data that the conclusion is supposed to be drawn from.
Appliance
A machine, usually one powered by electricity and used in the home.
Efficiency
A way of saying how much energy something wastes.
Kilowatt(kW)
A unit for measuring power. There are 1000 watts (W) in 1 kilowatt (kW).
Power
The amount of energy (in joules, J) transferred every second. It is measured in watts (W).
Power rating
The number of joules of energy an appliance uses every second.
Sankey diagram
A diagram showing energy transfers, where the width of each arrow is proportional to the amount of energy it represents.
Watt(W)
A unit for measuring power. 1 watt (W) is 1 joule (J) per second.
Kilowatt-hour(kWh)
The amount of energy used by a 1 kilowatt (kW) appliance in one hour. It is equal to 3600 kilojoules (kJ).
Payback time
The time it takes to get back (in energy savings) the money you spent on making an energy-saving change.
Climate change
Changes that will happen to the weather as a result of global warming.
Fossil fuel
A fuel formed from the dead remains of organisms over millions of years (e.g. coal, oil or natural gas).