rat skins
When there is material misstatement
yes
Because it's cheap and can resist wear
NOT a good idea to even consider using cheap fabric in your quilt or sewing project. Why go to all the trouble to make something of quality, only to have it fall apart because of a poor grade of fabric. Use the cheap fabric to work out a test sample of a specific pattern.
Cheap projector screens are usually made from plastic as this material is easily purchased and can also be made from recycled plastic which makes the material even cheaper for use in products such as a projector screen.
It depends on the amount used, how it is used, and more.
Use a symbolically pattern to pass the test.
You can test a material for conductivity by using a simple circuit with a power source (like a battery) and a bulb connected to the material in question. If the bulb lights up, the material is a conductor. Alternatively, you can use a multimeter to measure the resistance of the material - a low resistance indicates good conductivity.
To identify the hardness of an unidentified material, you can use a hardness test such as the Mohs scale, Vickers hardness test, or Rockwell hardness test. These tests involve applying a specific amount of force to the material's surface and measuring the indentation or scratch it creates to determine its hardness.
The real test for magnetism is to see if a material can attract other materials like iron or steel. This can be done by bringing a magnet close to the material and observing if there is an attraction or repulsion. Alternatively, one can use a compass to see if the material can influence its direction.
It is cheap, it is strong, it is reliable, it is versatile and it is simple and easy to use. In short, there is the perfect building material.
its a type of semiconductor, it is cheap and plentiful (raw material is sand), it is easy to fabricate, it has reasonable temperature characteristics.