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 pliers used to grab or hold hot objects from the dawn of recorded history. This article is about modern humans. ... For other uses, see Hand (disambiguation). ... Tongs used for cooking or serving food Tongs are gripping and lifting tools, of which there are many forms adapted to their specific use. ... A claw is a curved pointed growth found at the end of a toe or finger, or in arthropods, of the tarsus. ... For other uses, see Scissors (disambiguation). ... Needle-nose pliers Pliers are hand tools, designed primarily for gripping objects by using leverage. ...

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. For the Portuguese town and parish, see Lever, Portugal. ...

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 cosmetics for plucking eyebrows. Surface-mount components on a keydrives circuit board Surface mount technology (SMT) is a method for constructing electronic circuits in which the components are mounted directly onto the surface of printed circuit boards (PCBs). ... This article is about the engineering discipline. ... Make-up redirects here. ... Plucking, in the sense relating to glaciers, is when a glacier erodes away chunks of bedrock to be later deposited as erratics. ... Categories: Anatomy stubs | Human appearance ...

History

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 craftsmen holding 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.^[1] There is evidence of Roman shipbuilders pulling nails out of construction with plier-type pincers. For other uses, see Fire (disambiguation). ... Craftsman is an artisan who practices a handicraft or trade; a style of architecture and furniture arising from the Arts and Crafts movement; a military rank within the Royal Electrical and Mechanical Engineers, equivalent to a private; and a brand of tools. ... Oven depicted in a painting by Millet An oven is an enclosed compartment for heating, baking or drying. ...

Types

Flat tip conventional tweezers.

Tweezers come in a variety of tip shapes, including pointed, blunt and tapered. There are also various types of specialised forms of tweezers, including: Image File history File links Metadata Size of this preview: 800 × 600 pixelsFull resolution (1024 × 768 pixel, file size: 132 KB, MIME type: image/jpeg)By Richard Wheeler (Zephyris) 2007. ... Image File history File links Metadata Size of this preview: 800 × 600 pixelsFull resolution (1024 × 768 pixel, file size: 132 KB, MIME type: image/jpeg)By Richard Wheeler (Zephyris) 2007. ...

Optical tweezers use 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. An optical tweezer is a scientific instrument that uses a focused laser beam to provide an attractive or repulsive force, depending on the index mismatch (typically on the order of piconewtons) to physically hold and move microscopic dielectric objects. ... Properties For other meanings of Atom, see Atom (disambiguation). ... Biology studies the variety of life (clockwise from top-left) E. coli, tree fern, gazelle, Goliath beetle Biology is the science of life (from the Greek words bios = life and logos = word). ...

Magnetic tweezers use 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. A Magnetic Tweezer is a scientific instrument for exerting and measuring forces on magnetic particles using a magnetic field gradient. ...

Electric tweezers deliver an electrical signal through the tip, intended to damage hair roots and prevent new hair from growing from the same root. Electric tweezers are an electronic device intended to permanently remove hair. ...

Molecular tweezers are noncyclic host molecules that have two arms capable of binding guests molecules through non-covalent bonding. Trinitrofluorene bound in molecular tweezers reported by Lehn and coworkers. ... In supramolecular chemistry, host-guest chemistry describes complexes that are composed of two or more molecules or ions held together in unique structural relationships by hydrogen bonding or by ion pairing or by Van der Waals force other than those of full covalent bonds. ... Noncovalent bonding refers to a variety of interactions, that are not covalent in nature, between molecules or parts of molecules that provide force to hold the molecules or parts of molecules together usually in a specific orientation or conformation. ...

Notes and references