Using scientific measurements
There are many different ways of scientific measurements:
Percent error: This is used for scientist if they need to see how far off their value was from the acceptable value. The simple equation is; (Accepted Value - Experimented Value/ accepted Value) x 100 = percent error Example: Experimented Value is 40.9L Accepted value is 42.8L. What is the percent error 42.8-40.9 /42.8 x 100 = 4.4L
Percent error: This is used for scientist if they need to see how far off their value was from the acceptable value. The simple equation is; (Accepted Value - Experimented Value/ accepted Value) x 100 = percent error Example: Experimented Value is 40.9L Accepted value is 42.8L. What is the percent error 42.8-40.9 /42.8 x 100 = 4.4L
Accuracy vs Precision: Accuracy is how close the guessed value to the real value and Precision is how close all the measurements are to each other.
This is accurate
This is precise
Significant Figures: There is no way to tell if your estimate is right or not. So there are rules to make sure your estimates are as close as possible. Here are rules for getting significant figures:
Any number that is not 0 is significant (Example: 34.723 has 5 Sig Figs, 23 has 2 sig figs)
If a 0 is before any number it is NOT a sig fig. (Example: 00000.0003 has 1 sig fig, 000021 has 2 sig figs)
If a 0 is between numbers IS significant (Example: 305 has 3 sig figs, 1000003 has 7 sig figs)
If a 0 is after other numbers it is significant sometimes. It is a sig fig if it is after a decimal point (Example: 163.00 has 3 sig figs) if there is no decimal point it is not a sig fig
Any number that is not 0 is significant (Example: 34.723 has 5 Sig Figs, 23 has 2 sig figs)
If a 0 is before any number it is NOT a sig fig. (Example: 00000.0003 has 1 sig fig, 000021 has 2 sig figs)
If a 0 is between numbers IS significant (Example: 305 has 3 sig figs, 1000003 has 7 sig figs)
If a 0 is after other numbers it is significant sometimes. It is a sig fig if it is after a decimal point (Example: 163.00 has 3 sig figs) if there is no decimal point it is not a sig fig