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Why is it important that we all use the same system of measure

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Tools & Measurements

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Tools in Science It is necessary to collect data in science, we do this by taking measurements It is important that you use the proper tools for your situation Some tools you might use are thermometers, stopwatches, meter sticks and balances After you collect data you must analyze it using a calculator or a computer

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Making Measurements In the past many countries used different systems of measure. This caused problems when different countries were trading In the late 1700s the French Academy of Science tried to make a simpler system Over 200 years the metric system was formed

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Length A meter is the basic si unit for length

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Mass Mass measures the amount of a matter in an object The basic unit of mass is the kilogram However the kilogram is used to measure large objects, for smaller units you would use the gram

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Volume Volume is the amount of space that something takes up Liquid volume is measured using liters, it is the most commonly used unit of liquid volume The volume of a solid object is expressed in cubic meters, one cubic meter is equivalent to 1000 liters

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Density Density is the amount of matter in a given volume. It is impossible to measure density directly, you must first looks at the mass and volume The equation for Density is D=m/V Because we cannot determine it directly we call it a derived quality

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Density Continued If you are measuring the density of an irregular object; anything not rectangular, spherical, or triangular, you have to see how much water the object displaces. This is called Archimedes Principal, discovered by a Greek Scientist https://www.youtube.com/watch?v=ijj58xD5fDI

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Temperature Temperature is a measure of how hot a substance is There are three measures of temperature Fahrenheit, Celsius, and Kelvin In Fahrenheit water freezes at 32 degrees and boils at 212 In Celsius water freezes at 0 degrees and boils at 100 degrees In the Kelvin system water freezes at 273.15 and boils at 373.15

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Density Practice A piece of wood has a mass of 35 grams. If its volume is 7 cm 3, What is its density?

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Density Practice The density of a substance is 7.8 g/cm 3. What volume does 39 grams of it take up?

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Density Practice The density of water is 1 g/ml. What mass does 30 ml of water have?

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Density Practice What is the volume of a tank that can hold 18,754 Kg of methanol whose density is 0.788g/cm 3 ?

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Density Practice Calculate the mass of a liquid with a density of 3.2 g/mL and a volume of 25 mL.

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Density Practice An irregular object with a mass of 18 kg displaces 2.5 L of water when placed in a large overflow container. Calculate the density of the object.