Mechanical Engineering- A branch of engineering concerned primarily with the industrial application of mechanics and with the production of tools, machinery, and their products.    It is the broadest branch which overlaps with almost every branch of Engineering. Some of them are following- Aerospace  -  This branch of mech…

Definition- When some material cold below the certain temperature  (called critical temp.) then the resistance dropped to zero. this type of material is called superconductor and this phenomenon is called superconductivity. What is a superconductor? Superconductors are materials that conduct electricity with no resis…

Thermal stress is created when a change in size or volume is constrained due to a change in temperature. Due to change in the temperature, the material expands or contract. The amount δ T is given by δ T = α L ( T f − T i ) = α L Δ T δT=αL(Tf−Ti)=αLΔT where α is the coefficient of thermal expansion in m/m°C, L is the l…

Error The error is the difference between the actual value of a quantity and the value obtained by measurement. Every measurement has along with it a level of uncertainty which is known as an error.  No measurement can be done with perfect accuracy and precise but it is important to find out what an accuracy actually is an…

lubricant A substance (such as grease) capable of reducing friction, heat, and wear when introduced as a film between solid surfaces to improve efficiency and reducing wear. ex-  oil,grease,graphite. lubrication lubrication may be defined as " the reduction of friction and wear between the surface. this type of sub…