Please enable JavaScript.
Coggle requires JavaScript to display documents.
Chapter 2: Why is it important to know the physical properties of matter ?…
Chapter 2: Why is it important to know the physical properties of matter ?
Given diversity of things around us, it is important to classify things so that we can study them better
There are 5 main classes of material which are: Ceramic, metal, glass, fibres and fabric
What are some common physical properties of matter
How can understanding the physical properties of materials affect our choices for sustainable living
Every year tons of waste are generated and thrown into our seas then polluting the environment and the animals living there so we can used a reusable bag for groceries instead of plastics to pollute the planet less
strength a material can support a heavy weight has high strength while a material which cannot carry a heavy weight has low strength
Melting point and boiling point The melting point of a material is the temperature at which it changes from solid to liquid state and the boiling point of a material is the temperature at which it changes from liquid to gaseous state
Hardness A hard material can scratch another material that is softer than itself and it can resist wear and tear and scratches
6 .Flexibility a material is flexible has the ability to bend without breaking and return to its initial shape and size after bending
. Electrical conductivity if a material allows electric current to flow through it means that it has high electrical conductivity and if a material does not allow electrical current to flow through it has low electrical conductivity
Density . Density refers to the amount of matter an object has in proportion to its volume
How do we investigate the density of an object ?
We first have to fine the mass and volume of the object and divide the mass by the volume and then we have the density of the object
What are the effects of different densities ? when a substance has a lower density than water it will float in water and if a substance has a higher density that water it will sink in the water and if it has the same density than water it will be half floating and half sinking
Thermal conductivity if a material does not allow heat to flow through easily it has low thermal conductivity and if a material allows heat to flow through easily it has high thermal conductivity
Glass: 1. Transparent 2. poor conductor of heat and electricity 3. can be moulded into shapes 4. high melting point 5. Fragile
Metal: 1. Shiny 2. good conductor of heat and electricity 3. can be moulded into shapes 4. can be bent without breaking
Fibres: 1. can be spun into threads and woven into fabrics 2. able to absorb dyes 3. poor conductor of heat and electricity
Ceramic : 1. made of clay 2. poor conductivity of electricity 3. hard 4. can be moulded into shapes 5. does not corrode 6. has high melting point 7. fragile
Plastic: 1. light weight 2. does not corrode 3. can be moulded into shapes 4. has low melting point 5. poor conductor of heat and electricity