Density: Chapter 3 PDF

Saturday, 7 October 2023 Chapter-3: Density Lesson Outcomes: Keywords: 1) To demonstrate understanding of Force, mass, volume, density, relative concept of density and relative density, density....

Saturday, 7 October 2023 Chapter-3: Density Lesson Outcomes: Keywords: 1) To demonstrate understanding of Force, mass, volume, density, relative concept of density and relative density, density. Starter: 2) To find density of regular and Picture on next page irregular objects Learning Objective: Demonstrate understanding of force and pressure How does it work?  Density = amount of matter per unit volume 𝝆 PhET Simulation on Density: https://phet.colorado.edu/sims/density-and-buoyancy/density_en.html Density is the measure of the “compactness” of a material Closer the atoms and particles higher is the density Density includes both heaviness and space of an object. All substances have density including liquids, solids, and gases Learning Objective: Demonstrate understanding of force and pressure  Saturday, 7 October 2023 Chapter-3: Density Progress check Lesson Outcomes: 1) To demonstrate understanding of concept of density and relative density. 2) To find density of regular and irregular objects Learning Objective: Demonstrate understanding of force and pressure  How to Finding Density? To find density we need to find 1) MASS of the material 2) VOLUME of the material Learning Objective: Demonstrate understanding of force and pressure  How can we find Mass? BY Using Pan Balance Learning Objective: Demonstrate understanding of force and pressure  How can we find Volume? https://youtu.be/rOs3acfnLww By Calculation By Measuring cylinder H L W Learning Objective: Demonstrate understanding of force and pressure  Methods to find Density 1)Regular Shapes i) Find the mass, Displacement method for finding ii) Find the volume by volume: formula. iii) Use m/V to find density. i. Add water to a predetermined iv) EX: cubes, cylinders, level in a graduated cylinder – spheres, cones, etc. record it. 2) Irregular shapes: i) Find the mass, ii. Gently drop in the object. ii) Find the volume by displacement method. iii. Read the graduated cylinder – iii) Use m/V to find density. record it. Ex. Can be used for iv. Subtract the first water level from irregular and regular the second – this is the volume shaped object. What is the Density of the liquid? First find mass of the liquid Mass Of the liquid= 50 g Second find volume of the liquid Volume Of the liquid= Finally, density of the liquid Can you find answer for this?  Solve the followings 2. What is the volume of the object you 1. If the mass is 47 g and the volume is 3 placed in the water? If mass of stone is ml, what is the density of the object? 20g, its density is Ans: ___________ g/ml Level-1 Ans: ______________ g/ml Level-1 3. The adjacent rectangular block is 700g, the density of the block is Level-2 Ans: ___________ kg/m3 4. The mass of a sphere or diameter 6 cm is 70 g. What is the density of the object? Level-3 Ans: ___________ kg/m3 Density and related examples Learning Objective: Demonstrate understanding of force and pressure Deep sea fishes can change the volume of air in their body and can control their density. Therefore, easily can dive in deep oceans.  Density in Gases Gases can fill all the available space, larger the volume they fill smaller will be the density. The temperature cause expansion in gases in turn reducing the density. Warm air rises up and cold air settles down Learning Objective: Demonstrate understanding of force and pressure  Density in Liquids Ice is less dense than water (which is why lakes and ponds have a thin layer of ice covering in winter, with water underneath)  A steel bolt floating on Density in Solids mercury !! Materials can be identified and separated by using the concept of density.  Factors affecting Density nTemperature: Rise of hot air nPressure: Sea rocks are denser than rocks in earth crust nImpurity and concentration: you don’t sink in dead sea nAtoms in the material: Gold is far heavier than you think  Saturday, 7 October 2023 Chapter-3: Density Progress check Lesson Outcomes: 1) To demonstrate understanding of concept of density and relative density. 2) To find density of regular and irregular objects Learning Objective: Demonstrate understanding of force and pressure RELATIVE DENSITY = specific gravity Relative density is defined as the ratio between the density of a body and the density of some other reference body, generally water. Example: Density of Iron = 7800 kg/m3. Density of water = 1000 kg/m3. Density of Iron 𝑅𝑒𝑙𝑎𝑡𝑖𝑣𝑒Density of Iron relative to water = Density of water 7800 𝑅𝑒𝑙𝑎𝑡𝑖𝑣𝑒Density of Iron relative to water = 1000 𝑅𝑒𝑙𝑎𝑡𝑖𝑣𝑒Density of Iron relative to water = 7.8 API GRAVITY The American Petroleum Institute gravity, or API gravity, is a measure of how heavy or light a petroleum liquid is compared to water. if its API gravity is greater than 10, it is lighter and floats on water if less than 10, it is heavier and sinks. API gravity is an inverse measure of a petroleum liquid's density relative to that of water.  Project-1: Finding density of given objects Learning Objective: Demonstrate understanding of force and pressure