First, let's cover the basics. A pure substance is made from only one compound or just one element with no other substances mixed in. Hold up those two glasses, Katie. Imagine the pompoms ...

The phase diagram shows that the melting point of each of the pure elements is a unique value: 1357 K for copper and 1728 K for nickel. From: Newey and Weaver, "Materials Principles and Practice," ...

That pun is based on the fact that the main building blocks in the branch of science are chemical elements, pure substances ...

We also, confusingly, tend to refer to pure substances made of one kind of atom, like chlorine gas, as elements. But these are very different from the isolated atoms depicted on the periodic table.

First, let's cover the basics. A pure substance is made from only one compound or just one element with no other substances mixed in. Hold up those two glasses, Katie. Imagine the pompoms ...