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DENSITY AND SPECIFIC GRAVITY A property of matter representing the mass per unit volume g/ml –liquid -grams/milliliters g/cm3 -solid -grams/centimeters cubed 1ml = 1cm 3 Must be in grams, centimeters, and milliliters *no other units allowed

To Find the Mass (numerator) Grams -mass -solid -place item on balance scales -liquid 1. find the mass of an empty cylinder 2. find the mass of the cylinder with the liquid in it 3. subtract the two readings = the mass of the liquid

To Find Volume (denominator) Volume -ml or cm 3 Use a cylinder for liquid and read the meniscus (lowest level of liquid in the cylinder)

Volume of an Irregular Solid Use water displacement for a solid 1. put water in a cylinder and read 2. drop a solid in the water and read again 3. subtract the two readings

continued Water weighs 1 gram per milliliter Water’s mass is 1 gram per milliliter Water’s density is 1 gram per milliliter Anything more dense than 1 gram per milliliter will sink in water Anything less dense than 1gram per milliliter will float on water

Volume of a Regular Solid Volume for a regular solid using a meter stick, measure the height, width, and length H x W x L = the volume 1 side x 1 side x 1 side = the volume of a cube if all the sides are the same = the side cubed (g/cm 3 )

Review Volume of a rectangle L x W x H Volume of a cylinder (radius = diameter/2) pi x R 2 x H Volume of a sphere 4/3 x pi x R 2 (radius = circumference/pi/2) Check in passbook for equations

Label for Density So, Density = g/cm 3 or g/ml

Problems to Solve Density = ? cm3 = 5 g = 15 (per means to divide) g/cm 3 Grams = ? density = 6 g/ml ml = 2

Volume = 50cm 3 Mass = 100grams What is the density of this object Volume = 32 liters Mass = 40 centigrams (must change centigrams to grams before completing the problem)

Volume reading in cylinder water only 4ml water with rock8ml mass = 12 g Will it float or sink in water? What is the density?

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