In the measurement 0.544 m, which digit is the estimated?

I think for this question is better to read the corresponding Wikipedia page because it is a very interesting story to read how scientists tried to estimate it and it...

It is important to realize that when the term 'nutritional calorie' is used, they mean kilocalorie (= $1000$ calories). It is known that 1 calorie is approximately $4.184$ Joules....

The thing to remember when dealing with addition or subtraction is that the result must be rounded to the same number of decimal places as the measurement with the least...

The thing to remember about multiplication and division is that the resulting value cannot have more than the measurement that has the least number of significant figures. Simply put,...

This is an issue about precision. Every measurement has an inherent uncertainty. The better your measuring instrument the higher your precision and that means you can state the measurement with...

$"Precision"$ refers to the repeatability of your measurement.

$"Accuracy"$ just reflects the closeness of the measured value to the $"true value"$, whatever this is. $"Precision"$ refers to the repeatability of the measurement. An accurate measurement may be imprecise...

Depends on what you mean by precise. Precision can either be the number of decimal places to which you are sure, or the consistency of multiple trials. PRECISE...

$"Accuracy of a measurement"$ refers to how close the measurement is to the TRUE VALUE (however you asses it). $"Precision"$ refers to repeatability. The four measurements were thus imprecise, even...

Because there is no need for potassium or calcium to use $3d$ orbitals, which would have contained up to $10$ remaining electrons in the $M$ "shell". For $"K"$ and $"Ca"$...