If the experimental figure obtained is lower than the accepted known figure, the percent error is negative. Error is usually calculated as the absolute value so that there is no room for confusion.If the calculated value after performing the experiment is almost close to the known value, the percent error can be zero.Therefore the percent error is calculated as 14.07%. The percent error can be calculated as follows. 32g/cm3, which is lower than the known figure. But after experimenting, you find the density to be 2. The known density for this metal is 2.70g/cm3. % Error = (Experimental figure – Known value)/Known Value X 100įor example, you are performing an experiment to calculate the density of a piece of aluminum. Therefore, Percent error may be calculated as, If the experimental figure is more than the actual figure, the answer will be positive. When the experimental figure obtained is lower than the known value, the answer will be negative. Therefore, the difference between the experimental and the actual value is the error.Įrror = Experimental figure – Known value. It is also known as absolute error, and the lesser it is, the closer you are to the known value. Percent error compares the experimental figure obtained to the known or actual value. Subtracting the found measurement from the actual size, dividing it by the actual size, and then multiplying by 100 would net you the percent error □ Say you and your pals were asked to measure the court, and each of you found a different measurement □ That’s an error in the measurements. The markings or lines drawn in white need to be painted with total accuracy as the slightest difference can lead to major tournament upsets! □ Take a tennis court □, for instance, where dimensions have to be accurate. When you need to measure any item, you may not always get the measurement right the first time you measure it.
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