cubic meters
You would use cubic meters or cubic feet to measure the volume of a swimming pool. This unit accounts for the three-dimensional space that the pool occupies.
Liters or cubic meters are typically used to measure the volume of water in a swimming pool.
You would use meters.
inches
We use grams (g) as the unit of measurement to measure mass on a triple beam balance.
Feet.
a centimeter
A shoe.
Meters.
You would use CM or INCHES to measure a knife
always the meter to measure length. This is an SI (international) unit of measurment, and is the standard international unit of measurment for length.
You first need to decide what you want to measure about it: its length, its volume, its viscosity, etc.