Comparison Chart
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English system
􀁡 length: inches, feet
􀁡 mass: ounces, lbs
􀁡 Volume: pints,
gallons
• 􀁡 temp: °F
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Metric system
􀁡 length: meters
􀁡 mass: kilograms
􀁡 volume: liters
􀁡 temp: °C, °K
Metric Units-Ex 1.1
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Conversion of metric units and expression
in scientific
􀁡 notation ..
k h da base d c m μ n p are pre-fix symbols
gram, liter, meter are units in metric
Using prefix will help in metric conversions
Eg. Kg is kilogram unit for weight
Kl is kilolitre fo volume
Km is kilometer for distance
Ex 1.2
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Length
􀁡Take meter stick and identify:
􀁡m, dm, cm, mm.
Calculate lab book, lab partner,index finger
􀁡Area = length x width
Calculate Area for lab book
􀁡Dime measurement: thickness is 1 mm
􀁡measure one dime, calculate the rest
Volume
-Ex 1.3
• 􀁡Pure water:
• 1cc = 1ml = 1g 1dm3 = 1L = 1Kg
• 􀁡glassware, identify and know how to
read markings on:
• 􀁡beakers
• 􀁡graduated cylinders
• 􀁡graduated pipettes
• 􀁡Erlenmeyer flasks
Volume cont.
• meniscus (water’s adhesive property)
• 􀁡 pipette filling device - pump
• 􀁡know which pipette size is best for
specified volumes
• Eg 5 ml is for measuring 4.5 ml
• 2ml is for 1.7 ml
Mass
Ex .1.4
• Know how to use:
• 􀁡triple beam balance- for measuring Beaker, Lab book
• 􀁡electronic scale-for measuring light weights eg paper
clip
• Bathroom scale-for measuring yourself
• 􀁡Measure mass of volume of water using this equation:
• 1ml = 1gm = 1dm3
Temperature
-Ex 1.5
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Temperature
􀁡At sea level: 7
􀁡freezing point = 0°C 32°F
􀁡boiling point = 100°C 212°F
Determine temperature of four water baths in °C
and convert to °F. Convert real life applications.
Hot plate is used to boil water,Use tongs ..
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Know formulas for temperature conversions
°F = 9/5 °C + 32
􀁡 °C = 5/9 (°F – 32)
􀁡 Kelvin scale (K)
􀁡0°K is absolute zero, all molecular motion
ceases
􀁡0°K = -273°C so °K = °C + 273
Statistical Terms
Ex1.6
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Mean : average of measurements
􀁡Median : middle value
􀁡Range : the smallest to largest values
􀁡Deviation : + or – from the mean
􀁡Variance : sum of deviations2
􀁡Std. Deviation : sq.root of variance
Ex 1.7 Graphs
• Graphs are used to help you to visualise
data
• Refer to page 21 for data
• Graph on page 22
Scientific Notation
• Expression of numbers by using powers of
10
• 1000.0 is 1 x 103
• .000010 is 1X 10-5
Medical Importance
• Medical calculations -Usage of this is in
hospitals when drug dosages are calculated..
• If 30 mg of drug is to be given to 1kg of
patient,his weight is 100 pounds.What dosage
should you administer?
• Answer:1Kg is 2.21 pds ,so 100 pds will be
• 100/2.21 = 45.24 kg
• So the dosage would be 30x45.24 kg =1357mg