Download presentation

Presentation is loading. Please wait.

Published byKeyla Eddie Modified over 3 years ago

1
Density is a physical characteristic of every substance Density is the mass of unit volume What Is Density?

2
Density is a physical characteristic of every substance Density is the Mass of Unit Volume

3
What is Mass? Mass is a measure of the quantity of matter Mass is often confused with weight. The mass of anything is constant but weight is effected by location. A person/object will weigh less on the moon or in space than on earth because of the difference in gravity. Mass (the amount of matter) - blood, bones etc does not change. Weight changes because Weight = Mass x Gravity.

4
What is Volume? Volume is the amount of space an object occupies Volume is: length multiplied by width multiplied by height or or l X w X h In each case, the distance is in cm and since it (cm) is multiplied three times, this results get centimeters cubed

5
D equals Density M equals Mass V equals Volume Density is mass divided by volume or D= M/V

6
Density referred to as “mass per unit volume.” Mass is how much matter the object has Per simply means divided by Unit volume is a measure of how much space an object takes up

7
Calculating Density! Take the mass and divide by its volume!

8
What Are the Units of Density? Mass units would include – Grams for very small objects or – Kilograms for larger objects Volume units would include – Centimeters cubed (cm)3 for small objects or – Meters cubed (m)3 for large objects – Millilitres for small amounts of liquids – Litres for larger amounts of liquid - Both units (mass and volume) are included in answer for measuring density - Grams/Centimeter cubed or g/cm3

9
An Example? A block of wood L = 10 cm H = 4 cm W = 2 cm Mass= 160 grams Use the information provided to calculate the density of the object

10
Density = Mass/Volume Mass = 160g Volume = 10cm x 4cm x 2cm = 80cm3 Density = Mass/Volume Density = 160/80 = 2g/cm3 Further activities on measuring density visit: juniorscience.ie juniorscience.ie

11
Irregularly Shaped Objects To find the density of an irregularly shaped object - If the length, width, and height of the object, are not uniform e.g. a stone, you cannot use l X w X h to determine volume.

12
Irregularly Shaped Objects Start with a graduated cylinder of water filled about half full Record the volume of water in the cylinder Drop in the irregularly shaped object Record the volume of water in the cylinder with the object in it Subtract the original volume from the second volume to determine the volume of the object

13
You are measuring the amount of water displaced by the object which is equal to the volume of that object This is called: volume by displacement Handy !!

14
Liquids A liquid can be weighed to determine its mass. To do this, measure a cylinder in grams and record its empty mass Add the liquid Now weigh the cylinder again Subtract the mass of just the cylinder and this gives the mass of the liquid

15
Liquids To determine the volume, simply look at where the liquid measures in the cylinder and record the amount

16
Some Specific Densities : SubstanceDensity (g/cm 3) Gold19. 3 Mercury13. 5 Lead11. 3 Aluminum2. 7 Water (liquid)1. 0 Water (ice)0. 92 Air0. 0013

17
W HY DO SOME THINGS FLOAT WHILE OTHERS SINK?

18
Ever Notice… When you put ice into water it floats to the top Why? Ice is less dense than water by just a little bit. That is why your ice floats to the top of water.

19
Sink or Float? Solids can float or sink in a liquid. List examples of solids which would sink in water?

20
Any solid will sink in water if it has a density greater than the density of water. Water has a density of 1g/ cm 3 Any solid with a density greater than 1g/ cm 3 will sink in water! Any solid with a density less then water will float in water !

21
Can you explain how? Large ships can float on water? A submarine can submerge into the ocean depths? A hot air balloon floats into the sky? For explanation visit: juniorscience.ie juniorscience.ie

22
Further food for thought on density visit: www.juniorscience.ie www.juniorscience.ie

Similar presentations

Presentation is loading. Please wait....

OK

Density.

Density.

© 2018 SlidePlayer.com Inc.

All rights reserved.

To ensure the functioning of the site, we use **cookies**. We share information about your activities on the site with our partners and Google partners: social networks and companies engaged in advertising and web analytics. For more information, see the Privacy Policy and Google Privacy & Terms.
Your consent to our cookies if you continue to use this website.

Ads by Google

Ppt on van de graaff generator demonstrations Ppt on sources of data collection Ppt on doubly linked list Ppt on different types of dance forms renaissance Ppt on advertisement in hindi language Ppt on world diabetes day 2015 Ppt on 60 years of indian parliament pictures Download ppt on nutrition in plants for class 7 Ppt on file tracking system Ppt on world book day character