Which is more dense—a stack of 5 NT coins or a stack of 20 NT coins?

I think stack of 20 NT is more dense than stack of 5 NT coin, because 5 NT is 5 coins of 1 NT and 20NT is 20 coins of 1NT so 20 coins are bigger than 5 coins for volume and mass. Through this we can know that when we have more pices of stuff and more volume and mass, and when we have a lot of pieaces of stuff, space is going to be increase and it becomes more dense then these are dense than something other stuff.