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Crucible tongs are used most often with crucibles, small ceramic or metal vessels used to heat chemicals to temperatures up to 565.56 degree Celsius. [3] As a crucible will be very hot when heating it in a furnace or a Bunsen burner, one cannot hold the crucible directly. Therefore, crucible tongs come to play a key role when burning, or doing ...
The most straightforward type of air-free technique is the use of a glovebox. A "glove bag" uses the same idea, but is usually a poorer substitute because it is more difficult to purge, and less well sealed. Inventive ways of accessing items beyond the reach of the gloves exist, such as the use of tongs and strings.
Driller's round tongs, blacksmith's tongs or crucible tongs are of this type. A myth contained in the classical Jewish text Pirkei Avot states that the first pair of tongs was created by God right before God rested on the Seventh Day. The reasoning is that a blacksmith must use a pair of tongs in order to fashion a new pair of tongs.
Many locking forceps use finger rings/loops to facilitate handling (see illustration, below, of Kelly forceps). The finger loops are usually grasped by the thumb and middle or (more often) ring finger , while the index finger is placed on the pivot to help stabilize and guide the instrument.
The presence of a spout means that the beaker cannot have a lid. However, when in use, beakers may be covered by a watch glass to prevent contamination or loss of the contents, but allowing venting via the spout. Alternatively, a beaker may be covered with another larger beaker that has been inverted, though a watch glass is preferable.
Tweezers are thumb-driven forceps most likely derived from tongs used to grab or hold hot objects since the dawn of recorded history. In a scientific or medical context, they are normally referred to as just "forceps", a name that is used together with other grasping surgical instruments that resemble pliers , pincers and scissors -like clamps .
A test tube holder is used to hold test tubes. [1] It is used for holding a test tube in place [2] when the tube is hot or should not be touched. [3] For example, a test tube holder can be used to hold a test tube while it is being heated. [4]
A crucible and tongs, on a green mat. The ash content of a sample is a measure of the amount of inorganic noncombustible material it contains. The residues after a sample is completely burnt - in contrast to the ash remaining after incomplete combustion - typically consist of oxides of the inorganic elements present in the original sample.