Key terms & definitions

Variation in an energy source's output because it is not available continuously, as with wind and solar power.

Electricity generation that varies because its energy source is not continuously available, as with changing wind conditions.

A supply that varies or stops because the conditions needed for it are not always present.

An attraction acting between separate molecules; it is weaker than the covalent bonds within the molecules.

An attractive force between separate molecules, rather than a bond between atoms within a molecule.

Forces of attraction between separate molecules.

An answer left using the symbol $\pi$, rather than replacing $\pi$ with a rounded decimal.

An engine that burns fuel inside it to produce mechanical movement.

The exchange of information between people working within a business.

A struggle within a character between competing feelings, duties or beliefs.

A struggle within a character between competing feelings, desires or values.

Contamination in which radioactive material has entered the body, for example by inhalation, swallowing or through a wound.

Information held within a business, such as sales figures, customer records and records of previous marketing campaigns.

A line where two parts of a composite shape meet; it is not part of the perimeter if it lies inside the finished shape.

The total energy stored by the particles of a substance through their movement and their positions relative to one another.

The total kinetic energy and potential energy of all the particles in a system.

The total kinetic and potential energy of the particles making up a system.

The conditions surrounding the cells inside an organism, including temperature and the concentrations of water and glucose.

Finance generated from resources already within a business, such as retained profit or money raised by selling assets.

The process of accepting norms and values as one's own, so that they guide behaviour even without supervision.

Accepting a belief as personally correct, rather than only expressing it to fit in with other people.

Prejudice against women that a person absorbs and may reproduce, including in their treatment of other women.

Absorbing prejudiced ideas about your own group and applying them to yourself.

Believing that outcomes depend mainly on one’s own efforts and decisions.

A person forced to leave their home who remains within their own country.

A person forced to leave their home who remains within their own country.

Movement from one place to another within the same country.

Migration between places within the same country, such as moving from another UK city to London.

Movement from one area to another within the same country.

A presentation of a character's private thoughts rather than words spoken aloud.