science

• Systematic error is caused by the limitation of the measuring instrument used or the skill of the person conducting the measurements.
• Random error is caused by the unknown and unpredictable changes in the instrument or in the environmental conditions.
• Accuracy refers to the closeness of the measurement to be the accepted or true value of the measured quantity.
• Precision is the closeness of the repeated measurements of the same measured quantity with one another
• The accuracy of measurements obtained in an experiment can be compared with the accepted or true value by calculating the percentage error.
• Significant figures are numbers that are certain and meaningful
• Zeros next to nonzero digits are called trailing zeros.
• The exponent tells us the number of times the decimal point will be moved to either the left or the right.