Presentation on theme: "In Science and Medicine, We use the Metric System!"— Presentation transcript:
1 In Science and Medicine, We use the Metric System!
2 Dimensions Unit of length: meter Unit of mass: gram Unit of volume: liter
3 SI Base Units of Measurement Mass = the gram; g1 gram ≈ 1/28 ounceLength = the meter; m1 meter ≈ yardVolume = the liter; ldefined as 1000 cubic centimeters1 liter ≈ quartTemperature = degrees Celsius; oC
4 Prefixes The metric system uses prefixes to represent units smaller and larger than the fundamental unit by factors of 10.For example, a centimeter is 1/100 of a meter, and a kilometer is 1000 times a meterFor very large numbers, we use the powers-of-ten notation, e.g. 102 = 100, 106 = 1,000,000, 10-2 = 0.01
5 PrefixesOne of the clever ideas behind the system was to use only multiples of ten.
6 Converting Between Metric Units To convert from a LARGER unit of measure to a SMALLER unit of measure, MULTIPLY by the “order-of-magnitude difference” between the units.Example: 1.2 mg = ______ g1 mg = 1000 g1.2 mg = 1.2 x 1000 g = 1200 gRemember to check if your answer is logical.It should take a GREATER NUMBER of SMALL UNITS to equate to a LESSER NUMBER of LARGE UNITS.A microgram is smaller than a milligram (by a factor of 1000), so a given number of milligrams should be equal to many more micrograms (1000 times as many).
7 Converting Between Metric Units To convert from a SMALLER unit of measure to a LARGER unit of measure, DIVIDE by the “order-of-magnitude difference” between the units.Example: 250 ml = ______ l1 l = 1000 ml250 ml = 250 ÷ 1000 l = 0.25 lIs your answer is logical?It should take a LESSER NUMBER of LARGE UNITS to equate to a GREATER NUMBER of SMALL UNITS.A liter is larger than a milliliter (by a factor of 1000), so a given number of milliliters should be equal to fewer liters (1/1000 as many).
8 Thinking in Metric Units of Length 1 kilometer = ~0.62 or ~5/8 mi1 meter = 1.09 yard = 39.4 in1 centimeter = ~4/10 inch1 angstrom = 1/10 nm or 10-10m1 mile = ~1.6 km1 yard = ~0.91 m1 foot ~30.5 cm1 inch = ~2.54 cm
9 Thinking in Metric Units of Volume 1 liter = ~1.06 quart1 milliliter = 1 cubic cm (1cc) ~"a thimble full"Examples1 teaspoon ≈ 5ml12 oz. soda ≈ 360 ml2-liter bottle of soda1 gallon = ~3.8 l1 quart = ~0.95 l1 pint = ~0.47 l1 cup = ~240 ml1 fluid oz. ~30 ml2 liters~1/2 gal.
10 Thinking in Metric Units of Mass 1 kilogram = 2.2 pounds1 gram = ~"a thimble full" of waterExamples70 kg human = 154 lbs.1 ml of water weighs ~1 g1 pound = 454 g1 ounce = ~28 g
11 Estimate The length of: The volume of: The mass of: your bare foot your drivewayThe volume of:a coffee cupa bottle of shampooThe mass of:a steaka dog
12 Celsius: The Metric Temperature Scale Also called the centigrade scale.Definitions0 Celsius = 32 Fahrenheit = water freezes100 Celsius = 212 Fahrenheit = water boilsTherefore, 1C = 1.8FConversions Celsius = 5/9 x ( Fahrenheit - 32) Fahrenheit = (9/5 x Celsius) + 32100C212F0C32F
13 Thinking in Celsius -10 Celsius = frigid (14 F) 0 Celsius = cold (32 F)10 Celsius = cool (50 F)20 Celsius = comfortably warm (68 F)30 Celsius = hot (86 F)40 Celsius = very hot (104 F)What would you wear outside in tempsf:10C, 0C, 10C, 20C, 30C?