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Measurements chapter 3 Megan Harris (International system of units (SI…
Measurements chapter 3 Megan Harris
International system of units (SI system)
Updated version of metric system
Based on multiples of 10 making conversions very easy to figure out
Uses Prefixes and units
Common Prefixes
Kilo (K)-1,000 base units
Hecto (H)- 100 base units
deci (d) -1/10th base unit
Deka (D)- 10 base units
Base Unit = 1 base unit
centi (c)- 1/100th base unit
mili (m)-1/1000th base unit
Common Base units
Ampheres (amps)- current
Liters (l) - volume
Meter (m)- length
Gram(g)- mass
mole (mol)- Substance amount
Kelvin(k) - temperature
second (s)- time
Joule (j)- energy
Temperature scales
Kelvin
Water freezes at 272.16 k
water boils at 373.15k
fahrenheit
Water freezes at 32 degrees f
Water boils at 212 degrees f
Celsius
Water freezes at 0 degrees c
Water boils at 100 degrees c
Significant figures
non zeros
Examples
7,432=4 sig fig
2.Zero sandwich
left handed zeros
Zeros appearing to the left of the first nonzero number are not significant
examples
0.42=2 sig fig
1 more item...
examples
24.7= 3 sig fig
Zeros between nonzero numbers are significant
Examples
7,003=4 sig fig
400.79=5 sig fig
104=3 sig fig
every nonzero is significant
Right handed zeros
Zeros at the end of a number that are right of the decimal are significant.