Question

Define pressure. Give its unit in SI. How is pressure related to the sharpness of a knife and its ability to cut?

Answer 1

Answer= pressure is the continuous physical force exerted on or against an object by something in contact with it.

The unit of pressure in the SI system is the pascal (Pa), defined as a force of one Newton per square meter. The conversion between atm, Pa, and torr is as follows: 1 atm = 101325

presurre is inversaly proportional to area, pressure on the sharp knife is more which increases is cutting ablity A knife is a wedge, a simple tool. It applies lots of force to a small area creating lots of pressure on the edge. A sharper knife has less cutting area which means more pressure on the cutting edge. A dull knife has more area, which means less pressure. Spreading the pressure out encourages the item being cut to tend to hang together more and tear rather than slicing neatly.