TUESDAY 05/05/2020

SCIENCE

PROPERTIES OF MATERIALS

Every materials has specific properties that are different from the properties of other materials. 

- ODOUR: We perceive this property with the sense of smell. Some substances like water are odourless.

- STATE: Materials can be in a solid state (like wood), in a liquid state (like milk) and in a gaseous state (like air). In nature, water can be in the three different states.

- SOLUBILITY. This is the ability of a material to dissolve itself in another material. Ex. salt dissolves in water.

- COLOUR: Every material has a characteristic colour. Example: cotton is white. 

- TEXTURE is a property that we perceive with the sense of touch. Glass is smooth.

- BUOYANCY: a material floats on another if its mass occupies more volume (it is less dense) Oil is less dense than water. But oil is more dense than alcohol.

- MALLEABILITY: We can change the shape of malleable materials. For example the clay.

- STRENGTH indicates the capacity to resist a weight without breaking. Steel is a very strong material.

- MAGNETISM: Materials with magnetic properties attract iron and steel objects, such as clips.

- THERMAL CONDUCTIVITY AND INSULATION: A material is a good thermal conductor if heat passes through easily. For example, iron. A material is a good thermal insulator if heat does not pass through easily. For example wood, cork and plastic. 

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