Fill a plastic syringe with air up to its maximum reading and press your thumb over the nozzle. What is the volume of gas in the syringe?

Now press the plunger downwards, without letting any air escape.

What is the new reading on the syringe?

By what percentage has the volume of the air in the syringe decrea Watch your teacher warm a boiling tube of air as shown below:

Describe what happens.​

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia