Chapter 2.3
How can you measure the mass of a
liquid?
Chapter 2 Lesson 3
• How can you measure the mass of a
liquid?
• A balance is made to hold and weigh
solids, not liquids.
How to measure liquids or
irregular shapes?
-Use the subtraction system from the
total number
For Example:
A boy weighs himself and weighs
100lbs. And then, he weighs himself
with a dog, and weighs 120lbs. How
many lbs is the dog?
120lbs-100lbs= 20lbs
Measuring the mass of a
liquid
1. Measure the mass of an empty beaker on the
balance.
2. Pour the liquid into the beaker.
3. Measure the mass of the liquid plus the
beaker.
4. Subtract the mass of the empty beaker from
the mass of the beaker plus the liquid.
5. The answer will be the mass of the liquid.
mass of liquid = mass of liquid plus beaker – mass of beaker
(total number)
(empty beaker)
Formula
mass of liquid= mass of liquid – mass of
plus mass beaker beaker
+
=
+
Self-check page 36
1. A container has a mass of 150g.
What is the mass of a liquid if the
container plus the liquid has a mass
of 185?
1. A container has a mass of 125g.
When a liquid is added, the mass
becomes 163g. What is the mass of
the liquid?
Self-check page 36
3. If the mass of a liquid is 35g and it
is placed in a beaker having a mass of
75g, what will the mass of the beaker
plus liquid be?