chapter3 120206041628-phpapp02
TRANSCRIPT
Experiment 2: Arrangement of particle in liquid
The total volume of water and alcohol is less than 100ml.
This is because the particles of water and alcohol fill the empty spaces of each other.
Experiment 3: Arrangement of particles in gas
The gas particles can move very fast and freely in the jar because there are lots of spaces between them.
The smoke particles fill in the empty spaces between air particles just in few minutes.
THE PROPERTIES OF SOLID, LIQUID AND GAS (CONCLUSION)
No fixed shape
Far apart Arrangement
Movement
Very close Close
Vibrate and spin Move freely Very freely
BROWNIAN MOTION• Brownian motion is the movement of particles
without direction and this can be seen by viewing a smoke cell under microscope.
See video 3 (click here)
Video 3: http://www.youtube.com/watch?v=cDcprgWiQEY&feature=related
Click the video
3.3 The Concept Of Density
• Density is defined as mass per unit volume.• Density (g/cm3) =
• The density of a substance increases if mass increases volume decreases
)(cm Volume (g) Mass
3
How to compare the densities of objects?
• An substance which is less dense will float in a denser liquid.
• An denser substance will sink in a liquid which is less dense.
3.4 The Use Of Properties Of Matter In Everyday Life
• Gases can be compressed and transported in the form of liquid.
• The petroleum gases are liquefied under high pressure and stored in gas cylinders.
Ships And Boats
• The air space in ships and boats enables it to float on the water surface regardless of their weights.
• Therefore, the density of a ship or a boat is less than the water.
Hot air balloon
• Helium gas is less dense compared to the air outside the balloon.
• To raise the hot air balloon, the air is heated so that the air inside is less dense.
• To lower the balloon, the air temperature is reduced so that the air inside is denser.
Logs And Timbers
• Logs (timbers) are less dense than water.• They are transported to factories by rivers.