Because liquid and solid are two different things
The volume of a liquid can be calculated by using a measuring cylinder. The volume of a solid can be calculated by displacement, ie. if you have a 100 mL measuring cylinder with 25 mL of liquid in it, then you place the solid inside and the volume goes up to 45 mL, the volume of the solid is 45 - 25 = 20 mL.
By measuring it in a measuring cylinder or beaker or some container of a known volume.
litre
a gratuated cylinder in which you measure the volume of a liquid(volume same as mass)
When You are measuring the volume of an object(not liquid)
hydrometer
the size of its head
By measuring it in a measuring cylinder or beaker or some container of a known volume.
litre
You can measure the volume of a liquid by pouring it into a container with scale markings - measuring cup or graduated cylinder. The volume of a solid shape can be calculated by a geometric formula. If the shape is irregular, the volume can be found by displacement of a liquid. See the related link for a famous story!
The main disadvantage of using a pipet in measuring the volume of a liquid is that you cannot dispense large quantities.
with measuring tools
A measuring cup.
To measure volume of a liquid.
a gratuated cylinder in which you measure the volume of a liquid(volume same as mass)
The answer depends on the quantity of liquid. A graduated cylinder will not be much use in measuring the volume of liquid in an ocean!
They are two different ways of measuring. A balance measures weight (or technically, mass) while a graduated cylinder measures liquid volume.
You pour it into a measuring jug and see where the top of the liquid comes up to on the jug's measuring scale.