system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How can scientists determine scientific constants (like the speed if ligh, specific heat capacity of water, and the size if a proton) with such accuracy and without much experimental error?
gpt
Each of those things involves lots of careful experiments, repeated independently, with equipment designed explicitly for the purpose. It's a fundamental part of the process of science to determine those constants as accurately as possible.