PEAZIT Aha card
Go straight to resources ↓Heating: use the temperature change
Heating without a phase change depends on mass, specific heat capacity and temperature change: Q = mcΔT. Insert final minus initial temperature, not the final temperature alone.
| Observation | What it means |
|---|---|
| ΔT = 30 − 20 °C | a difference of 10 K |
| Double the mass | double the heat for the same ΔT |
One worked example
- m = 1 kg, c = 4200 J/(kg·K)Use the rounded value for water.
- 20 → 25 °C: ΔT = 5 KCelsius and kelvin differences have the same numerical value.
- Q = 1 × 4200 × 5 = 21000 JIgnore heat losses and the container.
Watch out: Melting or boiling can absorb heat without a temperature rise; latent heat must then also be considered.
Goal, prerequisites and card origin
What you will learn: Apply Q = mcΔT without a phase change.
What you need first: Mass and temperature.
An original PEAZIT working card. Independent expert review and effectiveness testing have not yet taken place. · v1
Reference for the underlying principle ↗Show connections
Heating without a phase change depends on mass, specific heat capacity and temperature change: Q = mcΔT. Insert final minus initial temperature, not the final temperature alone.