Your reliable thermometer doesn’t need to be well-calibrated—it only has to show the same value whenever it’s used to measure boiling water, regardless of what that value is. So the dependence isn’t quite so circular, thankfully.
You are saying it doesn’t need to be accurate. To show that boiling water is always the same temperature, the thermometer doesn’t need to display the rest that temperature …any consistent temperature will do …but it does need to avoid varying randomly, and that is reliability
Your reliable thermometer doesn’t need to be well-calibrated—it only has to show the same value whenever it’s used to measure boiling water, regardless of what that value is. So the dependence isn’t quite so circular, thankfully.
You are saying it doesn’t need to be accurate. To show that boiling water is always the same temperature, the thermometer doesn’t need to display the rest that temperature …any consistent temperature will do …but it does need to avoid varying randomly, and that is reliability