"All the results of atomic theory are down to random chance, and it's a useless model" [~0%]
"Atomic theory is the absolute best possible model for reality, and handles all edge cases ideally" [~0%]
I'd say 40 decibans is my minimum credence for ANY major established theory, simply due to the possibility of procedural error or unknown factors in any attempted disproof. i.e. I would assume that there's been at LEAST 10,000 erroneous results that purported to disprove the theory.
Alternately, if we assume there are at least a million scientists, and they average 1 test of the theory each, that gives us ~60 decibans.
If we take a common behavior that most of the world has done at least once, that gives us ~90 decibans
How much confidence do you place in the scientific theory that ordinary matter is made of discrete units, or 'atoms', as opposed to being infinitely divisible?
More than 50%? 90%? 99%? 99.9%? 99.99%? 99.999%? More? If so, how much more? (If describing your answer in percentages is cumbersome, then feel free to use the logarithmic scale of decibans, where 10 decibans corresponds to 90% confidence, 20 to 99%, 30 to 99.9%, etc.)
This question freely acknowledges that there are aspects of physics which the atomic theory does not directly cover, such as conditions of extremely high energy. This question is primarily concerned with that portion of physics in which the atomic theory makes testable predictions.
This question also freely acknowledges that its current phrasing and presentation may not be the best possible to elicit answers from the LessWrong community, and will be happy to accept suggestions for improvement.
Edit: By 'atomic theory', this question refers to the century-plus-old theory. A reasonably accurate rewording is: "Do you believe 'H2O' is a meaningful description of water?".