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So that you will not dirty your hands
Metal tongs are used for holding hot stuff
they are called beaker tongs :)
Tongs are used in a dark room so that the liquid will not spill or get on your clothes. Another reason tongs are used is so that the pictures are easy to handle and won't get messed up during development.
Experience, or indeed a little foresight shows that holding it anywhere else will result in getting your fingers or tongs burnt in the flame. Usually the thing you are trying to heat is at the bottom of the tube and the neck is farthest away from that.
When a crucible has been fired it is incredibly hot so the two most sensible reasons for using crucible tongs is firstly to prevent the users' hands from being burnt and secondly to prevent the bench in the laboratory from becoming damaged or burnt.
So that you will not dirty your hands
Tongs come in a variety of materials and styles. However, silicone kitchen tongs are safer to use on your hands and your pans compared to metal kitchen tongs.
Stamp tongs are special forceps used to handle stamps. They prevent the oils and dirt from your hands from getting on the stamps.
Ice tongs are most commonly used in bars and restaurants, instead of people using their hands. This is for many reasons: it is much more hygienic, easier to move the ice as the tongs are specially designed to hold each piece, and it prevents discomfort which a person would come across if they chose to use their hands.
Tongs
Before you fire up the grill, make sure you have the proper barbecue tools. Tongs are quiet possible the most important tool that you will need. Tongs can be used to flip just about anything that is on the grill. The tongs that you select should provide a firm grip. Gloves are another important tool. Barbecue gloves can prevent your hands from being burnt during cooking. You will also need to purchase a good set of cleaning tools.
Food tongs should be used where unwrapped food is served to the public. Tongs allow the food to be sold to a customer without the shop assistant having to touch the food with their bare hands first.
With your bare hands. Or you could just use salad tongs.
Metal tongs are used for holding hot stuff
Mainly to prevent contamination of foods, and sometime to protect your hands from heat.
Beaker tongs allow you to transport a hot beaker from one location to another. They are frequently used in chemistry. They are a grasping device consisting of two arms that are joined, often at one end, as by a pivot or a scissor like hinge.