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What is density?

What is density?. It is a measure of mass per unit of volume of a material or a substance. How is density calculated?. We use the formula: Density = mass / volume Units: g/mL. Will an object sink or float in water?.

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What is density?

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  1. What is density? It is a measure of mass per unit of volume of a material or a substance.

  2. How is density calculated? We use the formula: Density = mass / volume Units: g/mL

  3. Will an object sink or float in water? • If the object is less dense than water it will float. Meaning it has a density less than 1g/mL • If the object is denser than water it will sink. Meaning it has a density greater than 1 g/mL • Lets look at these examples:

  4. Sink or Float? Density # 1

  5. Find the density of the object below. The object was placed on a triple beam balance. 20 0 An object was dropped into a graduated cylinder that contained 40 mL. Determine the volume of that object. 5.4 I

  6. The solution … Volume = Volume of water & object – volume of water V = 65 mL – 40 mL V = 25 mL M = 25.4 g Density = Mass ÷ Volume D = 25.4 g ÷ 25 mL D = 1.01 g/mL Density of object is greater than water therefore ** The object will sink!

  7. Sink or Float? Density # 2

  8. Find the density of the box below. Mass386 g 23.5 cm 6.4 cm 7.8 cm

  9. The solution … Volume = length x width x height V = 23.5 cm x 7.8 cm x 6.4 cm V = 1173.12 cm3 M = 386 g Density = Mass ÷ Volume D = 386 g ÷ 1173.12 cm3 D = 0.33 g/cm3 **The box would float!

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