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Significant Figures
That depends on your goals AND on your measuring capabilities.
The answer depends on whether you are measuring the drops from a slow drip or the number of drops of water in an ocean!
5 significant figures.
20.2 has three significant figures.
Estimated
estimated
The degree of accuracy of the measuring instrument.
The least count of a measuring instrument is the smallest value that can be measured with the instrument. It determines the precision of the measurement. Significant figures, on the other hand, are the digits in a number that carry meaning about the precision of the measurement. The number of significant figures in a measurement is related to the least count of the instrument used to make that measurement.
The significant figures in a measurement of length and width depend on the precision of the measuring instrument used. Unless specified otherwise, we typically use the number of markings on the measuring instrument to determine the significant figures.
Significant Figures
Temperatures are typically measured with 1-2 significant figures, as precision beyond that is usually not needed for everyday purposes. However, in scientific contexts, temperatures can be measured with more significant figures depending on the sensitivity of the measuring instrument.
They tell you what level of precision you can expect from measurements that are made using that instrument.
That depends on your goals AND on your measuring capabilities.
A measurement that has a larger number of significant figures has a greater reproducibility, or precision because it has a smaller source of error in the estimated digit. A value with a greater number of significant figures is not necessarily more accurate than a measured value with less significant figures, only more precise. For example, a measured value of 1.5422 m was obtained using a more precise measuring tool, while a value of 1.2 m was obtained using a less precise measuring tool. If the actual value of the measured object was 1.19 m, the measurement obtained from the less precise measuring tool would be more accurate.
The greater the number of significant figures, the greater the precision. Each significant figure increases the precision by a factor of ten. For example pi = 3.14 is accurate to 3 significant figures, while pi = 3.14159 with 6 significant figures is a more accurate representation.
No, the units are independent of the accuracy. If you are measuring volume, how accurate the measurement is (or isn't) will not affect what you are measuring - it will always be volume.