GCSE Combined Science · key term

Direct proportionality

Definition

A relationship in which multiplying one quantity by a factor multiplies the other by the same factor, written $y \propto x$ .

Used by AQA

Specification 5.6.1.3, 6.5.4.2.2 · Paper 4, Paper 6

Revise: Collision Theory and Activation Energy
A relationship in which multiplying one quantity by a factor multiplies the other by the same factor. The symbol $\propto$ means ‘is proportional to’.
Revise: Newton’s Second Law: Relationships and Calculations

1
Use direct proportionality only where the question or a simple model supports it; doubling a factor does not always double the reaction rate.

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GCSE Combined Science · key term

A relationship in which multiplying one quantity by a factor multiplies the other by the same factor, written $y \propto x$ .

Used by AQA

Specification 5.6.1.3, 6.5.4.2.2 · Paper 4, Paper 6

Revise: Collision Theory and Activation Energy
A relationship in which multiplying one quantity by a factor multiplies the other by the same factor. The symbol $\propto$ means ‘is proportional to’.
Revise: Newton’s Second Law: Relationships and Calculations

1
Use direct proportionality only where the question or a simple model supports it; doubling a factor does not always double the reaction rate.

Create a free account to read GCSE Combined Science revision notes for your exam board and track your progress.