Practice question · Multiple choice
The temperature in a room is . What experiment does describe?
Hints
- The word "partial" means all other variables are clamped for the duration of the question.
- One variable moves, the rest are held: that is the definition unfolding.
Show the answer
D. Walk along with a thermometer, everything else frozen
Why
A partial derivative is a controlled experiment: vary one input, freeze the rest. Real changes usually vary everything at once, the chain rule will later reassemble the full change from these one-at-a-time answers.
Practise Partial Derivatives
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