Volume — Science definition
The space occupied by an object.
Where it is taught
- Cell Size & Exchange — Cells, Membranes & Exchange, Life Science: Biology, Grade 10
In use
Surface area describes the available boundary; volume describes the amount of interior to support.
Cell Size & Exchange
Questions using volume
Problem 1
Find area/volume for a cube with side length 3 mm.
Answer and explanation
2 mm⁻¹
6/3 = 2.
Problem 2
Doubling a cube’s side makes its volume…
- 2 times larger
- 4 times larger
- 8 times larger
- unchanged
Answer and explanation
8 times larger
Volume depends on the cube of length.
Problem 3
Compare area/volume ratios for cubes of side 1 mm and 2 mm. Explain the reasoning in your own words.
Answer and explanation
The larger cube has half the area per unit volume.
At 1 mm, area=6 and volume=1, ratio=6 mm⁻¹.
At 2 mm, area=24 and volume=8, ratio=3 mm⁻¹.
Response criteria
- Use the stated conditions.
- Show the evidence or calculation.
- Explain the conclusion and any stated limitation.
Problem 4
How can folds help a cell exchange materials without greatly increasing volume?
Hints
State what the supplied observations or conditions establish, and separate that from any assumption.
Answer and explanation
They increase membrane area available for transport relative to the volume served.