DENSITY.

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Presentation transcript:

DENSITY

Density and Buoyancy- Key Points Density is the ratio of mass to volume The solid state of a substance is usually denser than liquid state. The liquid state is denser than the gas state. What is Density? Video

BUOYANCY BUOYANCY = the ability to float in a fluid. Examples of fluids = water, air BUOYANT FORCE = the upward force that acts on a submerged object. It acts opposite of gravity

Why do Boats Float? 1st-Boats are designed to minimize water entry 2nd The water density vs. the boat’s density (metal of the boat, people, etc) is less than the water Result: THE BOAT FLOATS

A WHICH ONE IS MORE LIKELY TO FLOAT? Mass = 90 kg Mass = 90 kg B A WHICH ONE IS MORE LIKELY TO FLOAT?

DENSITY d = m / v DENSITY OF WATER = 1 g/cm3 If the object has a higher density, it sinks. If the object has a lower density, it floats. if the object has the same density, it flinks (floats in the middle of the water).

Density and Temperature CHANGING DENSITY BY ADDING HEAT RESULT: Particles move faster Particles spread apart Volume increases Density decreases FREEZING A LIQUID RESULT: Particles move slightly further apart Increasing volume Decreasing density

Measuring Units Density of liquids = Density of Gas = Density of Solids = Grams per milliliter (g/ml) Kilograms per liter (kg/L) Grams per cubic centimeter (g/cm3)

Calculating Density, Mass, Volume D= DENSITY M= MASS V=VOLUME Density= M V Mass= D x V Volume= M D

Sample Equation A 20ml sample of oil has a mass of 1. 76g Sample Equation A 20ml sample of oil has a mass of 1.76g. What is its density? G: V=2.0 mL M= 1.76g R: Density=? A= D=M V S: 1.76 2.0mL = 0.88g/mL S: The oil has a density of 0.88g/mL Steps: Given Required to find Analysis (Formula) Solution Statement

Sample Equation A liquid as a mass of 450g and a density of 0. 90g/ml Sample Equation A liquid as a mass of 450g and a density of 0.90g/ml. What is its volume? G:M=450g D= 0.90g/mL R: V=? A= V=M D S: 450g 0.90g/mL = 500/mL S: The volume of the liquid is 500/mL Steps: Given Required to find Analysis (Formula) Solution Statement

Homework Work on Questions 1-5