Coffee Appreciation

Potential idiotic question here....

Will 14g of coffee beans still weigh 14g once ground?

Reasoning behind the question is that I'm now using an MC2 to grind and for the first time in my coffee 'career' I've started to weigh my beans rather than guess. As I don't want stale beans in the hopper (I only make coffee at weekends, and then only 1-2 cups a day), I weigh beans then tip them in.

If you're weighing the beans, wouldn't it be simple enough to weigh the ground coffee as a test?