Fact 1: Agraduated cylinder is used to measure volume of a liquid.

Fact 2: For test cylinders without graduation marks, a manual calibration method has to be used.

Given the two facts above, answer the question "graduation markings are used to measure the what of a liquid" with the following options: 
- viscocity
 - size
 - flow
 - volume
 - density
 - smell
 - Decibels
 - tube


 

    volume     