Significant figures are the digits in a number that are reliable and accurate. They represent the precision of a measurement and indicate how much confidence can be placed in the value.
Reading significant figures from test tubes is important because it allows for accurate and precise measurements. This is especially crucial in scientific experiments where even small variations in measurements can have a significant impact on the results.
To read significant figures from 10/100mL test tubes, start by identifying the digits that are certain and those that are uncertain. The certain digits are the ones that are marked on the test tube, while the uncertain digits are estimated. Count the certain digits and include the first uncertain digit as the last significant figure.
If there are zeros at the beginning of the number, they are not considered significant figures. They are only placeholders to show the magnitude of the number. However, if there are zeros at the end of the number, they are significant figures and should be included in the final result.
Yes, significant figures can be rounded. When rounding, follow the rules: if the digit after the last significant figure is 5 or above, round up; if it is 4 or below, round down. However, keep in mind that rounding can affect the precision of the measurement, so it should only be done when necessary.