Εμφάνιση αναρτήσεων με ετικέτα Οι ιδιότητες των υλικών. Εμφάνιση όλων των αναρτήσεων
Εμφάνιση αναρτήσεων με ετικέτα Οι ιδιότητες των υλικών. Εμφάνιση όλων των αναρτήσεων

Τετάρτη, 30 Σεπτεμβρίου 2015

ιδιότητες των υλικών-Material properties

Materials have different properties that make them useful for different jobs. Here are some properties that materials have.

Transparent or opaque

Transparent materials do let light through (you can see through them). Opaque materials do not let any light through (you cannot see through them).
Illustration of a window

Waterproof

Waterproof materials do not let water through and do not soak up water.
Illustration of an umbrella

Absorbant

Absorbent materials soak up water and let water pass through them.
Image of a soaken woolly jumper

Strong or weak

Strong materials are very difficult to break. Weak materials break easily.
Illustration of a wooden chair

Flexible

Flexible materials are easy to bend.
Illustratio of a scarf

Rigid

Rigid materials are difficult to bend.
Image of a red bicycle

Hard

Hard materials are difficult to scratch.
Illustration of a diamond

Magnetic

Magnetic materials are attracted to magnets.
Illustration of a magnet

Conductors

Some materials are good conductors of heat. This means heat can travel through them easily.
Some materials are good conductors of electricity. This means electricity can travel through them easily.
Illustration of a radiator

Insulators

Some materials are insulators of heat. This means they do not allow heat to travel through them very easily. Some materials are insulators of electricity. This means that electricity cannot travel through them.

Cooking with a saucepan

Metals

Illustration of a saucepan and a knifeMetals come from rocks called ores.
They are strong, hard and shiny materials that can be hammered into different shapes without breaking.
Many metals are good conductors of heat and electricity.
Some metals are magnetic. Iron is the most magnetic metal. Steel is also magnetic because it is made of mostly iron.
Their properties make them useful for objects such as cutlery, saucepans, cars and coins.

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