Notes - 1-3 Measurment

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A Standard Measurment System
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Why is there a standard measurment system?
Using Si allows science to comunicate data easier
Stands for "International System"
Base unit for length
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1 km = 1,000 m
1 m = 100 cm
1 m = 1,000 mm
1 cm = 10 mm
Weight vs Mass
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Weight:
Your weight is a measure of the force of gravity on you
The force of gravity may be more or less on other planets or moons
You would weight about one-sixth of your Earth weight on the Moon
The Newton (N) is the Si unit, the Pound (lb) is the English unit
Mass:
Mass is the measurment of the amount of matter an object contrains
Mass is not measured by gravity
If you travel to the Moon, the amount of matter in your body (your mass) will not change
Scientists prefer to use mass rather than weight
The Si unit of mass is the kilogram, but grams will be mostly used in this class.
Volume:
Volume is the amount of space an object takes up
The Si unit of volume is the cubic meter (m^3) but more than likely it will be measured in Liters (L) or millileters (mL)
Volume of a Rectangular Solid:
Ex: Cereal Box
Volume = Length * Width * Height
Volume of an Irregular Solid:
Ex: Rock
Submerge rock in water in graduated cylindar and measure the displacement of the water
Density:
Density is mass per unit volume
Density = Mass/Volume
Si unit of density is kg/m^3. Other common units are g/cm^3 and g/mL.
Time
The second (s) is the SI unit of time.
1 s = 1,000 ms
1 min = 60 s
1 h = 60 min
Temperature
The SI unit of temperature is the Kelvin (k)
0*C = 273 k
32*F = 373 k (?)