Task 2

Measuring the volume of bodies with different shapes using a beaker

Objective of the work:

To learn how to determine the volume of a body using a measuring cylinder (beaker)

Practical part of the work

How to measure the volume of a body using a beaker is based on the fact that when we submerge it in a liquid, the volume of the liquid with the submerged body increases by the volume of the body. The good thing about this method is that it can be used to measure the volume of irregularly shaped bodies (e.g. a stone or a potato) which cannot be found by measuring the linear dimensions of these bodies. You have already learned how to use the beaker (measuring cylinder) during the first laboratory work. It is very easy to measure the volume of a body.

It is only important that the body is small and can be completely placed in the available beaker. The procedure is as follows:

Step 1: To start, prepare all the necessary instruments

  • Plasticine (half of 1 clay)
  • Cylinder
  • String
  • Eraser
  • Beaker
  • Glass with water

Step 2: Students will do all lab work as a group

Step 3: Pour the amount of water you need into the beaker and measure the initial volume of water.

For example the amount of water on the beaker is 30ml. Mark it V1

Step 4: Take 1 body to be measured. It is best to tie a string to the body whose volume you are going to measure. This makes it easier to gently lower the body into the water and then remove it from the beaker. If the body is floating in water, you have to immerse it completely in water with a pencil. Otherwise you will only measure the volume of the part of the body that is under water.

Step 5: Completely immerse your body in water

Step 6: Determine the volume of water with a body submerged in it. Note the volume of water and the body V2

Step 7: The difference between the original volume and the volume of the liquid in which the body is immersed is equal to the volume of that body.

V=V2-V1,

V2 is the volume of water and the body,

V1 – initial volume of water in the beaker

Step 8: Repeat all measurements with 3 different bodies.

Step 9: Record all data in the table.

Note: When completing the table all values are converted to SI system. For example

№ experiencesИсследуемое телоInitial volume of liquid in the beakerVolume of the body and liquid in the beakerVolume of a solid
1Eraser   
2Plasticine   
3Сylinder   

Conclusion

Conclude on tasks 1 and 2.

For example: During the laboratory work, we learned how to measure the volumes of bodies using a measuring cylinder and found out that the volume of bodies is equal to the difference between the volume of water in which the body is immersed and the original volume of water.