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Density A Characteristic Property of Matter

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Density Density is a basic characteristic property of all matter A characteristic property is a property that stays the same for a particular type of matter. For instance: H 2 O boils at 100 o C and freezes at 0 o C Every substance has a density that can be measured Scientists use density to help identify different kinds of matter

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Formula for calculating density Density is mass per unit of volume Density is mass divided by volume D =

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Unit for Density Mass is measured in grams Volume is measured in ml or cm 3 Therefore, the unit for density is g/ml or g/cm 3

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How Do We Measure mass? Scientists use a triple beam balance to measure mass. What is the mass illustrated on the triple beam balance?

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How do we measure volume? How would you use to measure the volume of a regularly shaped object, such as a box? Which one is the meter stick? V = l x w x h How would you use to measure the volume an irregularly shaped object, such as a rock?

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You Have Choices! Both choices involve water Both choices move water out of the way to make room for the object To move something out of the way to make room for something else is called DISPLACEMENT Therefore, this method is referred to as the WATER DISPLACEMENT METHOD

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But First, lets review how to read the volume of a fluid Does the word meniscus ring a bell? Meniscus: the curvature of a liquid in a tube Most liquids curve down, some curve up If the liquid curves down, you measure the bottom of the curve If the liquid curves up, you measure the top of the curve What is the volume of the H 2 O and the Hg (mercury)?

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The Proper Way to Measure Eye Level!

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OK, back to the choices! Method #1: Place object in graduated cylinder and read the increase in volume. Method #2: Place the object in an overflow can and measure the amount of water displaced.

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Question How would you measure the MASS of a liquid? What must you remember to do first?

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Now you can calculate density You can measure the mass of the object You can measure the volume of the object Divide the mass of the object by its volume and you have calculated the density

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Minds on Science Obtain 2 different size graduated cylinders Fill each cylinder about half full with H 2 O Determine mass and volume of the H 2 O in each cylinder Calculate the density of the water in cylinder #1 Calculate the density of the water in cylinder #2 What did you find out?

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density Density of a substance is a characteristic property This means that density will always be same for that substance no matter the size or amount. Example: The density of H 2 O is always 1g/ml or 1g/cm 3

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Minds on! Explain this, if you can Hint, density is involved and something else that can affect the density of a liquid. THINK

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