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Published bySabrina Godsil Modified over 2 years ago

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DENSITY

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KEY QUESTIONS What is density? How is density measured? How do you calculate density?

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How close the atoms or molecules are to each other More than “heaviness” - density includes how much space an object takes up!! All substances have density including liquids, solids, and gases Density is the measure of the “compactness” of a material

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“Compactness”

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DENSITY Density describes how much mass is in a given volume of a material.

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Mass is amount of matter in an object (usually measured in grams) Volume is the amount of space an object takes up (usually measured in ml or cm 3 )

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We have a kilogram of feathers and a kilogram of steel… which has more mass? Which has a larger volume? Which is more dense? OR

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DENSITY EQUATION Density = mass/volume or D= m/v A solid wax candle has a volume of 1,700 mL. The candle has a mass of 1.5 kg (1,500 g). What is the density of the candle?

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Calculating Density 1.Looking for: …the density of the candle 2.Given: …mass = 1500 g; volume = 1700 mL 3.Relationship: D = m/V =.88 g/mL SOLVING PROBLEMS Solution: 1,500 g ÷ 1,700 mL = g/mL

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WHAT DO YOU THINK? If the volume stays the same and the mass increases... the density will If the mass stays the same and the volume increases... The density will

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LEAD FLOATS ON LIQUID MERCURY! EXPLAIN.

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DENSITY Solids, liquids and gases are matter, so they all have density. The density of water is about one gram per cubic centimeter.

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DENSITY The units used for density depend on whether the substance is solid or liquid. For liquids use units of grams per milliliter (g/mL) For solids use density in units of g/cm 3 or kg/m 3.

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DENSITY Density is a property of material independent of quantity or shape.

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DENSITY OF COMMON MATERIALS Liquids tend to be less dense than solids of the same material. Ex. solder

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DENSITY OF COMMON MATERIALS Water is an exception to this rule. The density of solid water (ice) is less than the density of liquid water.

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DENSITY OF COMMON MATERIALS Ice vs. water…..

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DETERMINING DENSITY To find the density of a material, you need to know the mass and volume of a solid sample of the material. 1.Mass is measured with a balance or scale. 2.Use the displacement method or calculate the volume.

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DETERMINING DENSITY Regular Shapes – mass, then determine the volume by formula EX: cubes, cylinders, spheres, cones, etc. Irregular shapes – mass, then measure displacement of a liquid (usually water) by that irregularly shaped object 1. Use a graduated cylinder 2. Add water to a predetermined level - record. 3. Gently drop in the irregularly shaped object. 4. Read the graduated cylinder – record. 5. Subtract the first water level from the second – this is the volume

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DENSITY TABLE SINK or FLOAT In Water (D = 1.0 g/mL) Float Sink Float (alcohol ) (fuel)

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