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- https://chem.libretexts.org/Courses/University_of_Arkansas_Cossatot/UAC%3A_Chem_1024/Unit_0%3A_Primer/1.7%3A_Significant_FiguresThere is a certain amount of ambiguity here; if we take "9 in" to mean a distance in the range 8.5 to 9.5 inches, then the implied uncertainty is ±0.5 in, which is 1 part in 18, or about ± 6%. The rel...There is a certain amount of ambiguity here; if we take "9 in" to mean a distance in the range 8.5 to 9.5 inches, then the implied uncertainty is ±0.5 in, which is 1 part in 18, or about ± 6%. The relative uncertainty in the answer must be the same, since all the values are multiplied by the same factor, 2.54 cm/in.
- https://chem.libretexts.org/Courses/Lansing_Community_College/LCC%3A_Chem_151_-_General_Chemistry_I/Text/01%3A_Introduction_-_Matter_and_Measurement/1.6%3A_Dimensional_AnalysisDimensional analysis is used in numerical calculations, and in converting units. It can help us identify whether an equation is set up correctly (i.e. the resulting units should be as expected). Units...Dimensional analysis is used in numerical calculations, and in converting units. It can help us identify whether an equation is set up correctly (i.e. the resulting units should be as expected). Units are treated similarly to the associated numerical values, i.e., if a variable in an equation is supposed to be squared, then the associated dimensions are squared, etc.
- https://chem.libretexts.org/Courses/Arkansas_Northeastern_College/CH14133%3A_Chemistry_for_General_Education/02%3A_Measurement_and_Problem_Solving/2.04%3A_Significant_Figures_in_CalculationsTo round a number, first decide how many significant figures the number should have. Once you know that, round to that many digits, starting from the left. If the number immediately to the right of th...To round a number, first decide how many significant figures the number should have. Once you know that, round to that many digits, starting from the left. If the number immediately to the right of the last significant digit is less than 5, it is dropped and the value of the last significant digit remains the same. If the number immediately to the right of the last significant digit is greater than or equal to 5, the last significant digit is increased by 1.
- https://chem.libretexts.org/Courses/Eastern_Mennonite_University/EMU%3A_CHEM_155_-_Matter_and_Energy_(Yoder)/Unit_1/A%3A_Preliminary/2.5%3A_Significant_Figures_in_CalculationsTo round a number, first decide how many significant figures the number should have. Once you know that, round to that many digits, starting from the left. If the number immediately to the right of th...To round a number, first decide how many significant figures the number should have. Once you know that, round to that many digits, starting from the left. If the number immediately to the right of the last significant digit is less than 5, it is dropped and the value of the last significant digit remains the same. If the number immediately to the right of the last significant digit is greater than or equal to 5, the last significant digit is increased by 1.
- https://chem.libretexts.org/Courses/Riverland_Community_College/CHEM_1000_-_Introduction_to_Chemistry_(Riverland)/02%3A_Measurement_and_Problem_Solving/2.04%3A_Significant_Figures_in_CalculationsTo round a number, first decide how many significant figures the number should have. Once you know that, round to that many digits, starting from the left. If the number immediately to the right of th...To round a number, first decide how many significant figures the number should have. Once you know that, round to that many digits, starting from the left. If the number immediately to the right of the last significant digit is less than 5, it is dropped and the value of the last significant digit remains the same. If the number immediately to the right of the last significant digit is greater than or equal to 5, the last significant digit is increased by 1.
- https://chem.libretexts.org/Courses/American_River_College/CHEM_309%3A_Applied_Chemistry_for_the_Health_Sciences/01%3A_Topics_in_General_Chemistry_I/1.03%3A_Converting_Units-Dimensional_AnalysisThe ability to convert from one unit to another is an important skill. A unit can be converted to another unit of the same type with a conversion factor.
- https://chem.libretexts.org/Workbench/Pick_Your_Poison%3A_Introduction_to_Materials_Toxicology/05%3A_Measurement_Uncertainty_Accuracy_and_PrecisionQuantities can be exact or measured. Measured quantities have an associated uncertainty that is represented by the number of significant figures in the measurement. The uncertainty of a calculated val...Quantities can be exact or measured. Measured quantities have an associated uncertainty that is represented by the number of significant figures in the measurement. The uncertainty of a calculated value depends on the uncertainties in the values used in the calculation and is reflected in how the value is rounded. Measured values can be accurate (close to the true value) and/or precise (showing little variation when measured repeatedly).
- https://chem.libretexts.org/Courses/Mount_Royal_University/Chem_1201/Unit_0%3A_Foundations/0.4%3A_Dimensional_AnalysisDimensional analysis is used in numerical calculations, and in converting units. It can help us identify whether an equation is set up correctly (i.e. the resulting units should be as expected). Units...Dimensional analysis is used in numerical calculations, and in converting units. It can help us identify whether an equation is set up correctly (i.e. the resulting units should be as expected). Units are treated similarly to the associated numerical values, i.e., if a variable in an equation is supposed to be squared, then the associated dimensions are squared, etc.
- https://chem.libretexts.org/Courses/SUNY_Adirondack/CHM_103%3A_Principles_of_Chemistry/01%3A_Chemistry_and_Measurements/1.7%3A_Converting_UnitsThe ability to convert from one unit to another is an important skill. A unit can be converted to another unit of the same type with a conversion factor.
- https://chem.libretexts.org/Courses/Brevard_College/CHE_103_Principles_of_Chemistry_I/01%3A_Matter_Measurements_and_Calculations/1.09%3A_Converting_UnitsThe ability to convert from one unit to another is an important skill. A unit can be converted to another unit of the same type with a conversion factor.
- https://chem.libretexts.org/Courses/Saint_Marys_College_Notre_Dame_IN/CHEM_122-02_(Under_Construction)/1%3A_Review_from_CHEM_121/1.02%3A_Uncertainty_in_MeasurementMeasurements may be accurate, meaning that the measured value is the same as the true value; they may be precise, meaning that multiple measurements give nearly identical values (i.e., reproducible re...Measurements may be accurate, meaning that the measured value is the same as the true value; they may be precise, meaning that multiple measurements give nearly identical values (i.e., reproducible results); they may be both accurate and precise; or they may be neither accurate nor precise. The goal of scientists is to obtain measured values that are both accurate and precise.
