1. Chapter 3 - Measurements
UNIT 1 Foundations
Chapter 3 - Measurements

2. Chapter 3C The Science of Measuring

3. Weight
Weight
Indicates the amount of matter, but does not measure the amount of matter directly
A measure of the earth’s gravity acting on the matter
Measure in Newtons, a unit of force
1 Newton = 0.224lb
Weight can change from place to place, different sea levels
Spring scale and an electronic scale both measure weight

5. Mass Mass A measure of the amount of matter in an object
Measured using a balance
Gravity is necessary to have in order to use the balance, but it cancels out on both sides so it is irrelevant
Electronic balance and inertia are other ways to measure mass

7. Volume Volume The space enclosed or occupied by an object
Regular Solid objects - calculations
Length x width x height or other formulas
Liquids
calibrated beaker, volumetric flask, pipette, graduated cylinder
The surface of a liquid is not flat. The curved surface is the meniscus and at its center is where the volume is read.
The meniscus can be concave or convex depending on the liquid
Water displacement method
Can be used to measure the volume of a small, irregular shaped solid

9. Density
Density
The amount of matter or the mass of the substance contained in a specific volumetric unit
Helps to identify certain kinds of matter
You can calculate the density if you know the mass and volume