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In chemistry, the melting point of an element is the temperature at which the atomic vibrations that cause solids to turn into liquids become disruptive enough to overcome the forces holding the atoms together. The higher the temperature, the more disruptive the vibrations and the faster the melt forms.
The melting temp of lead is relatively low compared to other metals. This makes it a suitable material to use in soldering and other electrical applications.
Solder is an alloy of tin and lead, with the tin typically being 60% and the lead 40%. Lead-free solders are also available, which have lower melting temperatures and better wetting than tin-lead.
When solder is heated, it begins to melt at a temperature known as its melting point, which is the temperature at which it turns from a solid into a liquid. The melting temperature of tin is 232°C and that of lead is 328°C. The tin-lead solder alloy has a much lower melting point, making it easier to work with than either pure tin or lead.
When working with molten lead, it is important to avoid breathing the fine dust particles that form when it is stirred or melted. This can be done by keeping the metal in a well-ventilated area or wearing a protective mask. Inhaling lead dust is poisonous. It is also necessary to avoid moisture getting into molten metals, as this can cause them to segregate into a paste-like substance known as dross.