《大学物理》英文课件1 measurement幻灯片课件.ppt

Measurement
Dr. Huaqiu Deng
E-mail: ******@scut.
1-1 Measuring Things
What is physics?
- We discover physics by learning how to measure the quantities involved in physics.
- Physics is based on measurement and experiment.
Measure physical quantity in its own units, parison with a standard.
Pick out a small number of physical quantities, and assign standards to them alone.
Define all other physical quantities in terms of these base quantities and their base standards.
International System of Units (SI) (metric system)
Quantity
Unit Name
Unit Symbol
Length
meter
m
Time
second
s
Mass
kilogram
kg
1-2 The International System of Units
Factor
109
106
103
10-2
10-3
10-6
10-9
10-12
Prefix
giga-
mega-
kil