What one idea you have about how rescue workers can get energy to their electrical devices in these situations

Different types of steels contain different elements that alter the characteristics of the steel. for each of the following elements, explain what the element does when alloyed with steel.

The thermal expansion or contraction of a given metal is a function of the f a)-density b)-initial temperature c)- temperature difference d)- linear coefficient of thermal expansion e)- final temperature f)- original length

What is the heat treatment of metals? what is the benefit of it? why and how it's useful? answer in details, do not write by hand.