Determine the percentage error.

So we found that aluminium has a specific heat capacity of 18441J/KgC

And I know that the percentage error = mv-av/av x 100%

But how do we know the actual value of aluminium? My teacher never gave it to us. And when it says mv-av does it mean the measured values actual value?

Thank you!!

google it: Aluminum 0.900kJ/KgC

you got 18kJ/kgC

Your percent Error is fantastic. Recheck your calculations.

To determine the percentage error, you need to have an actual or accepted value for the specific heat capacity of aluminium. This value could be obtained from a reliable source such as a reference book, scientific paper, or by conducting a well-established experiment.

If your teacher has not provided you with the actual value, you can search for it online or in reference materials. For example, the specific heat capacity of aluminium is commonly reported as approximately 900 J/kg°C.

Once you have the actual value, you can calculate the percentage error using the equation you mentioned:

percentage error = [(measured value - actual value) / actual value] x 100%

In this equation:
- "measured value" refers to the value you obtained through your experiment or measurement.
- "actual value" is the accepted or known value obtained from a reliable source.

Substitute these values into the equation and calculate the percentage error. Remember to use the same units for both values, in this case, J/kg°C.

It is important to note that the equation assumes a positive value for the percentage error. If the measured value is less than the actual value, the percentage error will be negative. In such cases, you can take the absolute value of the percentage error to express it as a positive number.