1 Density Name: Kenneth Tan Jun Wei Class: 102 Index Number: 16 ACE: Term 2

2 What is Density? Known as mass per volume Known as mass per volume Used to measure a material or objects compactness Used to measure a material or objects compactness A form of describing mass in a continuous system A form of describing mass in a continuous system

3 Factors that affect Density Mass of an object Mass of an object Volume of an object Volume of an object What kind of state is the object in What kind of state is the object in e.g. solid state, liquid state, gaseous state e.g. solid state, liquid state, gaseous state etc etc Regular or irregular shaped Regular or irregular shaped

4 Units of Density SI unit for Density is kg/m or g/cm SI unit for Density is kg/m or g/cm One thousand kilograms per cubic meter equals one gram per cubic centimeter [1000 kg/m = 1 g/cm ] One thousand kilograms per cubic meter equals one gram per cubic centimeter [1000 kg/m = 1 g/cm ]

5 Formula to finding Density Formula: Density= Density= E.g. The mass of iron is 27kg and its volume is 3m, find the density of iron. is 3m, find the density of iron. Density= Density= =9kg/m Mass Volume 3 27kg 3m 3 3

6 Steps taken to find Density of an object Step 1: Measure the mass and volume of the substance Step 2: Divide the mass of the substance by its volume its volume Density= Density= Mass Volume

7 Steps taken to find density of a regularly shaped object Step 1: Measure the mass and calculate Step 1: Measure the mass and calculate from dimensions, the volume of the object from dimensions, the volume of the object Step 2: Density= Step 2: Density= Mass Volume

8 Steps taken to find density of an irregularly shaped object First place the egg on a measuring scale and you will be able to find the egg’s mass.

9 Next, fill the eureka beaker until water starts flowing out of its spout. Allow it to stand until it stops to flow.

10 Then, place a measuring cylinder right below the spout and slowly lower the egg into the water. Density= volume of the egg=volume of the water that flows out of the spout Mass Volume

11 Steps taken to find density of a liquid The steps that have to be taken to find density of water is similar to the steps taken to find a substance. Step 1: Measure the mass and volume of the liquid Step 2: Divide the mass and the volume of the liquid Density= Mass Volume

12 Steps taken to find Density of Gas Step 1:Take the molecular formula weight of the gas (grams per mole—from the periodic table) Step 2:Divide that by the standard molar volume for a gas, which is 22.4 L per mole density= FW 22.4

13 Solids and their Density SubstancePlatinumGoldLeadSilverCopperIronZincAluminiumIceg/cm

14 Solids and their Density SubstanceGlassPinewoodcorkg/cm

15 Liquids and their Density SubstanceMercury Glycerine Sea Water Pure Water( at 4 degrees Celsius) Olive Oil Turpentine Petrol Alcoholg/cm

16 Gases and their Density SubstanceAirHydrogenHeliumNitrogenOxygen Carbon Dioxide g/cm

17 Floating and Sinking Some objects float while others sink. Some objects float while others sink. The deciding factor whether the object floats or sinks is actually density. The deciding factor whether the object floats or sinks is actually density. Objects that float on water have a lower Objects that float on water have a lower density than water, while objects that sink have a higher density than water.

18 Picture of objects that float and sink in water. Objects that float have a smaller density than water. While, objects that sink have a higher density than water.

19 Sources -specific-weight-gravity-d_290.html -specific-weight-gravity-d_290.html karentimberlake.com/ppz/density.ppt karentimberlake.com/ppz/density.ppt /sat2/chemistry/chapter5section11.rhtml /sat2/chemistry/chapter5section11.rhtml

20 Density Thank you for your kind attention