Using a Graduated Using a Graduated CylinderCylinder

Using a Graduated Using a Graduated CylinderCylinder

1. Understand the size of the graduated 1. Understand the size of the graduated cylinder and its markings- cylinder and its markings-

100:1ml near the top means it is a 100 100:1ml near the top means it is a 100 milliliter (ml) beaker and has a line milliliter (ml) beaker and has a line marking every one milliliter incrementmarking every one milliliter increment

500:5ml near the top means it is a 500ml 500:5ml near the top means it is a 500ml beaker and has a line marking every beaker and has a line marking every 5ml increment5ml increment

What would 10:0.2ml mean?What would 10:0.2ml mean?

Size of a Graduated Size of a Graduated CylinderCylinder

100:1ml 10:0.2ml

How to read the volume of a How to read the volume of a liquid liquid

in a graduated cylinderin a graduated cylinderThe The meniscus meniscus is is ““the upper surface of the upper surface of

a liquid in a tubea liquid in a tube””. The meniscus . The meniscus tends to be U-shaped in a graduated tends to be U-shaped in a graduated cylinder.cylinder.

Meniscus

How to read the volume of a How to read the volume of a liquid liquid

in a graduated cylinderin a graduated cylinder1. 1. Always measure volume in a Always measure volume in a graduated cylinder at the bottom graduated cylinder at the bottom of the meniscus.of the meniscus.

2. 2. Always look straight from the Always look straight from the side of the meniscus at the side of the meniscus at the graduated cylinder to measure graduated cylinder to measure volume.volume.

NOT from aboveNOT from above

NOT from belowNOT from below

Reading a graduated Reading a graduated cylindercylinder’’s volumes volume

From above meniscus WRONG!!!!!

From below meniscus WRONG!!!!!

Reading a graduated Reading a graduated cylindercylinder’’s volumes volume

From the side of the meniscus CORRECT!!!

Measuring volume of an Measuring volume of an irregularly-shaped objectirregularly-shaped object

1.Put a moderate amount of water in a 1.Put a moderate amount of water in a graduated cylinder and measure the graduated cylinder and measure the volume.volume.

2. Place the object in the graduated cylinder 2. Place the object in the graduated cylinder with the water.with the water.

3. Measure the volume of the water in the 3. Measure the volume of the water in the graduated cylinder with the object graduated cylinder with the object submerged in it.submerged in it.

4. Subtract the volume of just the water from 4. Subtract the volume of just the water from the volume of the water with the the volume of the water with the objectsubmerged. This value tells you the objectsubmerged. This value tells you the volume of the object.volume of the object.

Measuring volume of an Measuring volume of an irregularly-shaped objectirregularly-shaped object

For example, if there is 85ml of For example, if there is 85ml of water in a graduated cylinder water in a graduated cylinder and you add an object, then the and you add an object, then the volume of the water and the volume of the water and the object is 92ml. What is the object is 92ml. What is the volume of the object?volume of the object?

92ml (volume of water with object 92ml (volume of water with object submerged)submerged)

-85ml (volume of just the water)-85ml (volume of just the water)

7ml (volume of object)