Measurements and Calculation
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- Comparison based on an accepted scale
- Contain a number AND a unit
- Technique used to express very large or very small numbers
- Based on powers of 10
ex 3.6 x10e-4
Centi (Symbols, value, SN)
Milli (Symbol, value, SN)
When do you use 10e0?
When the number in question already has only 1 digit left to the decimal
7.31 -> 7.31x10e0
1 inch equals
Amount of three-dimensional space
SI unit = m3
Volume of gas and liquid are commonly measured in what unit?
What does 1mL equal?
1mL = 10-3L = 0.001L
Amount of matter present
1kg = 103g = 10000g
1kg = how many lbs?
1kg = 2.2046lbs
1lb = how many grams?
Uncertainty in Measurement
A measurement always has some uncertainty
- Used to indicate the uncertainty of a measurement
- Measurements are report with one(last) uncertain digit
- + or - 1
- Numbers known with certainty
- Have unlimited number of SFs
- 1min=60 seconds
- Number of people in a room
Multiplying and dividing with SFs
- Result has the same number of SFs as the measurement with the smallest number of SFs
- Count SFs and round off to the correct SF
Adding and Subtracting SFs
You take the largest AU (uncertainty) and apply that to the answer
Kelvin to Celsius conversion equation
Tc = Tk - 273.15
Ferinheight to Celsius conversion equation
Tc = (TF - 32.00)/1.80
Celsius to Ferinheight equation
TF = 1.80(Tc) +32.00
Celsius to Kelvin equation
TK= TC + 273.15
When converting how do you count SFs
Report converted temp to the same amount of uncertainty as the original term
Density = Mass/Volume
- A property of matter representing the mass per unit vol
- A conversion factor between mass and volume
SI units for density (solid, liquid, gas)
- Solids - g/cm3Liquids - g/mL
- Gasses- g/L
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