Metric System Scientific Measurements

Metric System Developed by the French in the late 1700’s. Developed by the French in the late 1700’s. Based on powers of ten, so it is very easy to use. Based on powers of ten, so it is very easy to use. Used by almost every country in the world, with the notable exception of the USA. Used by almost every country in the world, with the notable exception of the USA. Especially used by scientists. Especially used by scientists.

Metric Prefixes Regardless of the unit, the entire metric system uses the same prefixes. Regardless of the unit, the entire metric system uses the same prefixes. Common prefixes are: Common prefixes are: kilo = 1000 centi = 1/100 th milli = 1/1000 th 1 meter = 100 centimeters= 1000 millimeters

Base Units The base unit for volume is the Liter. The base unit for volume is the Liter. We measure volume with a graduated cylinder. We measure volume with a graduated cylinder.

Liters Kiloliter = (1000 L) K Kiloliter = (1000 L) K Hectoliter = (100 L) H Hectoliter = (100 L) H Dekaliter = (10 L) D Dekaliter = (10 L) D Liter = (1 L) M/L/G Liter = (1 L) M/L/G Deciliter = (.1 L) D Deciliter = (.1 L) D Centiliter = (.01 L) C Centiliter = (.01 L) C Milliliter = (.001 L) M Milliliter = (.001 L) M

Milliliter A milliliter (that is "milli" and "liter" put together) is a very small amount of liquid. A milliliter (that is "milli" and "liter" put together) is a very small amount of liquid. Here is a milliliter of milk in a teaspoon. Here is a milliliter of milk in a teaspoon. It doesn't even fill the teaspoon! It doesn't even fill the teaspoon! If you collect about 20 drops of water, you will have 1 milliliter: If you collect about 20 drops of water, you will have 1 milliliter:

Liter A liter is just a bunch of milliliters put all together. In fact, 1000 milliliters makes up 1 liter: A liter is just a bunch of milliliters put all together. In fact, 1000 milliliters makes up 1 liter: This jug has exactly 1 liter of water in it. This jug has exactly 1 liter of water in it. Milk, soda and other drinks are often sold in liters. Milk, soda and other drinks are often sold in liters.

Kiloliter The capacity of a truck tanker is in kiloliter The capacity of a truck tanker is in kiloliter A company produces several kiloliters of ethanol every day A company produces several kiloliters of ethanol every day 25 kiloliters could be the best estimate for the capacity of a water tank 25 kiloliters could be the best estimate for the capacity of a water tank

Volume Volume is the amount of space contained in an object. Volume is the amount of space contained in an object. We can find the volume of box shapes by the formula Volume = length x width x height We can find the volume of box shapes by the formula Volume = length x width x height In this case the units would be cubic centimeters (cm 3 ). In this case the units would be cubic centimeters (cm 3 ). So a box 2 cm x 3 cm x 5cm would have a volume of 30 cm 3 So a box 2 cm x 3 cm x 5cm would have a volume of 30 cm 3 V = L x W x H copyright cmassengale

Graduated Cylinders Liquids form curved, upper surfaces when poured into graduated cylinders Liquids form curved, upper surfaces when poured into graduated cylinders To correctly read the volume, read the bottom of the curve called the meniscus To correctly read the volume, read the bottom of the curve called the meniscus copyright cmassengale

Measuring a Liquid Read the measurement based on the bottom of the meniscus or curve. When using a real cylinder, make sure you are eye-level with the level of the water. What is the volume of water in the cylinder? _____mL copyright cmassengale

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Water Displacement We can use water displacement to find the volume of objects that are not boxed shaped. We can use water displacement to find the volume of objects that are not boxed shaped. We can put water in a graduated cylinder. If a rock causes the level to rise from 7 to 9 ml, the the rock must have a volume of 2-mL. We can put water in a graduated cylinder. If a rock causes the level to rise from 7 to 9 ml, the the rock must have a volume of 2-mL.

Displacement examples How much did the water rise? How much did the water rise? How much did the water rise?

Extra Conversion Practice 1) mL = ___________ L 1) mL = ___________ L 2) kL = __________ daL 2) kL = __________ daL 3) 3.87 cL = ____________ hL 3) 3.87 cL = ____________ hL 4) L = __________ dL 4) L = __________ dL 5) mL = ___________ cL 5) mL = ___________ cL 6) kL = __________ dL 6) kL = __________ dL

Try this worksheet This should be completed in a whisper or silent This should be completed in a whisper or silent If you need any help, please raise your hand and wait for me to come over. If you need any help, please raise your hand and wait for me to come over. Please come up to the front when your finished to pick up your HW sheet. Please come up to the front when your finished to pick up your HW sheet.