Ch 3.2 and 2.4 Flashcards
0
Q
Derived Units
A
- Carefully defined and can be derived from other base units
1
Q
Base Units
A
- Carefully defined and cannot be derived from other units
2
Q
Units before Metric System
A
- First known units: Indus Valley Civ.
- Egyptian length: Cubit
- Taking measurement was not possible without units
- Developing units made trade and commerce possible
- Developing universally understood units was difficult
- Units that did not work: Virgate, League, Rood, Jigger, Jack, Grain
3
Q
In order to be unit, it must be….
A
- Clearly defined
- Reproducible
- It’s meaning will not change with time
- Easy to understand & convert between similar units
4
Q
Metric System background
A
- 1791: French Academy of Scientist made Metric system
- Went into use in 1795
- Defined meter as 1/10000000 of the distance between Dunkirk and Barcelona
- Created platinum bar for other meters to be compared
5
Q
Tera
A
- 10 to the 12th
- Symbol: T
6
Q
Giga
A
- 10 to the 9th
- Symbol: G
7
Q
Mega
A
- 10 to the 6th
- Symbol: M
8
Q
Kilo
A
- 10 to the 3rd
- Symbol: k
9
Q
Hecto
A
- 10 to the 2nd
- Symbol: h
10
Q
Deca
A
- 10 to the 1st
- Symbol: da
11
Q
No prefix means…
A
-One
12
Q
Deci
A
- 10 to the -1
- Symbol: d
13
Q
Centi
A
- 10 to the -2
- Symbol: c
14
Q
Milli
A
- 10 to the -3
- Symbol: m
15
Q
Mirco
A
- 10 to the -6
- Symbol: upside-down h)
