Physics A-Level
Mass difference
What Mass difference means in Physics A-Level, as defined for AQA.
Definition of Mass difference
Check what you remember
Read the wording for your board, then hide it and explain Mass difference in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: AQA
The total mass before the reaction minus the total mass after the reaction.
Topics that use Mass difference
- Mass and energy (A-level only) (AQA A-Level)
Related terms
- Atomic mass unit
- Binding energy
- Binding energy per nucleon comparisons
- Breakdown of classical mechanics at relativistic speeds
- Energy release in nuclear reactions
- Energy released per kilogram of fuel
- Energy–mass equivalence
- Fusion and fission
Using Mass difference in the exam
Check the command word and mark scheme for your exact question. After comparing your explanation with the reference, use the term in an answer on the linked topic. This practice does not predict an exam mark.
Practise Physics questions
Create a free account to answer exam-style questions on this topic and get feedback on your answers.
Start free
All Physics A-Level termsA week of Premium from your first lesson · Then the free plan continues · No card, no charge