Measuring the Volume by Displacement of Water
After calculating the volume of each slug, now add water to the graduated cylinder. Next, read precisely the amount of water in the graduated cylinder. Make sure when reading the graduated cylinder that you are reading the meniscus then record the reading. For example, the reading on this graduated cylinder is 17.4 mL.
Notice that this is a 25 mL graduated cylinder and each small white mark represents 2 mL. The white bands that go all the way around the cylinder are the odd numbers such as 15 mL, 17 mL, 19 mL, and 21 mL.
Now you are going to add the slug to the graduated cylinder. Do this VERY CAREFULLY! Make sure to tilt the cylinder and slide the slug slowly down the side of the graduated cylinder.
Do this so that the water is not splashed out of the cylinder or the bottom is not broken out.
|After adding the slug, make sure that the level of the water is above the slug but not above the last reading mark on the graduated cylinder. Here are examples of what NOT to do.|
|Here is an example of how your graduated cylinder should look after slowly adding the slug and making sure the amount of water in the cylinder is above the slug.|
|This graduated cylinder would be read as 22.5 mL.
After you have made sure that your measurements are precise, then calculate
the volume for each slug.
To calculate the volume of the slug from above, take the final reading - initial reading.
22.5 mL - 17.4 mL = 5.1 mL
Therefore, the volume of the slug by displacement is 5.1 mL.