Volume of a stone
Use the water level rise.
An odd shape
A stone has no regular shape, so you cannot use l × w × h.
How can you find its volume?
What this lesson covers
The idea
Lower the irregular object, tied to a thread, into a measuring cylinder of water; the final water level minus the initial level gives its volume, and mL can be written as cm³.
An odd shape
A stone has no regular shape, so you cannot use l × w × h.
How can you find its volume?
- Lower it into water in a measuring cylinder and see the rise
- Weigh it on a balance
- Measure its colour
Lower the stone
Press Next step.
Water displacement
The rise in the water level shows the space the object takes up. The volume is read in mL, which can be written as cm³ for solids.
Volume of an irregular solid = final water level − initial water level. mL can be written as cm³.
Notes
Final level − initial level = volume of an irregular solid (mL = cm³).
Check yourself
Initial water level 30 mL. After lowering a stone, the level is 38 mL. What is the volume of the stone in cm³?
Answer: 8 cm³
38 − 30 = 8 mL = 8 cm³.
The stone is tied to a thread so that it can be …
The volume of the stone is found by …
For a solid, the volume found in mL can be written in …
- weighed. The thread helps lower it into the cylinder.
- lowered slowly into the water — correct. Yes!
- coloured. The thread helps lower it into the water.
- adding the two levels. Subtract, not add.
- multiplying the two levels. Subtract the initial level from the final level.
- subtracting the initial level from the final level — correct. Yes!
- cm³ — correct. Yes!
- kg. kg is for mass.
- m. m is for length.