Answer:
The comparison of unknown quantity with known quantity is called measurement.
<span> If a force is applied over a smaller surface area you get a larger <span>pressure</span></span>
A. The metal shield will heat up, and then heat the air on the student's side of the shield.
The overall force of gravity becomes stronger and stronger. This is because the gravity depends on the inverse of the square of the distance:

and since the distance r between the molecules becomes smaller, the gravity increases more and more.