What does 'mass' mean in Kaspa's transaction system?

In Kaspa, 'mass' is the network's jargon for measurable sizes that limit how much transaction throughput the network allows, based on the externalities — costs that a transaction imposes on the network as a whole. Every resource a transaction consumes has to be accounted for so the network can enforce fair limits; Kaspa groups those resource costs under the single concept of mass. Without such a mechanism, one transaction could consume a disproportionate share of shared network resources and degrade performance for everyone else. Understanding mass helps you see why Kaspa's design deliberately tracks resource usage to keep the network fair and sustainable for all participants.