Tweezers are tools used for picking up small objects that are not easily handled with the
human hands. They are probably derived from tongs, pincers, or scissors-like pliersused to grab or hold hot objects from the dawn of recorded history.
Tweezers make use of two third-class levers connected at one fixed end (the fulcrum point of each lever), with the pincers at the others.
Tweezers have many uses, such as gold panning, in the manual construction or repair of many things such as models, clockwork,
surface mount electronics; or in cosmeticsfor plucking eyebrows.
Two sticks would be used to pinch another stick over a stone age
fire. Tweezers are known to have been used in predynastic Egypt. There are drawings of Egyptian craftsmenholding hot pots over ovens with a double-bow shaped tool. Asiatic tweezers, consisting of two strips of metal brazed together were common to Mesopotamia and India about 3000 B.C. These likely served purposes such as catching lice.cite book
title = The Bronze Age
first = Vere
last = Childe
publisher = Biblo & Tannen
year = 1963
id = 0819601233] There is evidence of Roman shipbuilders pulling nails out of construction with plier-type pincers.
Tweezers come in a variety of tip shapes, including pointed, blunt and tapered. There are also various types of specialised forms of tweezers, including:
Optical tweezersuse light to manipulate microscopic objects as small as a single atom. The radiation pressure from a focused laser beam is able to trap small particles. In the biological sciences, these instruments have been used to apply forces in the pico Newton range and to measure displacements in the nm range of objects ranging in size from 10 nm to over 100 mm.
Magnetic tweezersuse magnetic forces to manipulate single molecules (such as DNA) via paramagnetic interactions. In practice it is an array of magnetic traps designed for manipulating individual biomolecules and measuring the ultrasmall forces that affect their behavior.
Electric tweezersdeliver an electrical signal through the tip, intended to damage hair roots and prevent new hair from growing from the same root.
Molecular tweezersare noncyclic host molecules that have two arms capable of binding guests molecules through non-covalentbonding.
*Stamp tweezers or
Stamp tongs are specially designed tweezers used for handling postage stamps.
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