conservation of energy
Pronunciation
Noun
B1 Intermediate
Quick answer
A scientific principle stating that the total amount of energy in a closed system stays the same, even as it changes form.
Usage notes
This is one of the most fundamental laws in physics, meaning energy is never created or destroyed, only transformed.
Test yourself
Which word fits the gap? "The rollercoaster's motion is a classic example of the _____ in action."
Answer: conservation of energy
In your own words, what does "conservation of energy" mean?
A scientific principle stating that the total amount of energy in a closed system stays the same, even as it changes form.
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