Metallograph

Metallograph is an instrument which photographs microstructure (the structure seen using microscope).

Bacillus thuringiensis

Bacillus thuringiensis is a bacterium species which infects and even kills a number of caterpillar species.

Pressure

Pressure occurs in a fluid when it is subjected to a force.

1 bar = 100 kPa

1 atmosphere = 1.013 bar

Gear box

The gearbox is an important part of an automobile. It transmits power from the engine crankshaft to the rear wheels. Some important types of gear box are synchromesh gear box, sliding mesh gear box and constant mesh gear box.

Clutch

The clutch is an important component of an automobile transmission system, which transmits power from the engine to the gear box at various speeds.

Calomel electrodes

Calomel electrode consists of solid mercurous chloride Hg₂Cl₂ (Calomel) in contact with mercury.