Answer:
Any substance that cannot be decomposed into simpler substances by ordinary chemical processes.
Another definition:
An element is the simplest pure substance which can neither be split nor built up from other simpler substances by chemical reaction
<span>It is used for the separation of fluids, gas or liquid, based on density.
Hope this helps!</span>
Explanation:
This is because gas particles are free to move as they are not held in place by strong molecular forces while particles in a solid are
