system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How can software not have mass?

How can software not have mass if it fills a        
space/hard drive and can get to the point where no more "bytes" can "fit" inside said drive? What is being filled and shouldn't there be an observable change in some type of measurement if not mass? So basically, how can software have no physical presence yet operate on physical hardware?
gpt
Consider a table covered in coins. You can store information by turning coins to heads or tails, each coin representing one bit. We might say the table is "full" when you're using all the coins to represent some meaningful data, but the coins are always there and have the same mass as they do if you "blank" the table to all heads.