Mechanical Engineering Portal

Macroscopic and Microscopic views of thermodynamics are used to study the behavior of matter. Suppose the matter is investigated based on its behavior based on a certain amount or volume, without consideration of its properties at the molecular level. In that case, it…

Pascal’s law states that “Pressure applied to an enclosed fluid is transmitted undiminished to every portion of the fluid and the walls of the containing vessel”. A small force (F 1 ) is applied to a piston with a small area (A 1 ), resulting a much larger force F 2  …

Pressure (symbol: p or P) is a measure of force distribution over any surface associated with the force. Pressure is a surface phenomenon and it can be physically visualised or calculated only if the surface over which it acts is specified. Pressure may be defined as …

Newton, along with his three laws of motion, published the law of gravitation in 1687.  According to Sir Isaac Newton, “Every particle of matter in the universe attracts every other particle with a force that is directly proportional to the product of the masses of the…

Petroleum is the main source of liquid fuels , obtained from drilled wells under the Earth’s crust. Petroleum originated probably from organic matter such as fish and plants by bacterial action or distillation under pressure and heat. It consists of a mixture of gases,…

There are many theories of fatigue; I have written briefly about three of them: the Orowan theory, the fatigue limit theory, and Wood’s theory. 1. Orowan Theory: Orowan theory considers the metal to contain small, weak regions. Slip occurs readily along these regio…

A key is a machine element fitted in an axial direction into the mating member, such as pulleys, gears. The key's primary function is to prevent the relative rotation between the shaft and mating member. In most applications, the keys' secondary function is to…