To calculate the percent error, we use the formula:

$\text{Percent Error} = \left( \frac{\text{Experimental Value} - \text{Theoretical Value}}{\text{Theoretical Value}} \right) \times 100$

In this case:

• The experimental value is the volume of water actually measured, which is $7.95$ mL.
• The theoretical value is the intended or accepted volume, which is $8.00$ mL.

Now, plug in these values to find the percent error:

$\text{Percent Error} = \left( \frac{7.95 - 8.00}{8.00} \right) \times 100$

Let's calculate this:

$\text{Percent Error} = \left( \frac{-0.05}{8.00} \right) \times 100 = \left( -0.00625 \right) \times 100 = -0.625\%$

Since percent error is usually expressed as a positive value, we take the absolute value:

$\text{Percent Error} = 0.625\%$

Conclusion:

The percent error in measuring the volume is 0.625%.

Would you like further details or have any questions? Here are some related questions you might consider:

1. What are some factors that could cause percent error in a volume measurement?
2. How does the precision of the measuring instrument affect the percent error?
3. Can percent error be greater than 100%? Under what circumstances?
4. How would you minimize errors in a laboratory setting?
5. What is the difference between percent error and absolute error?

Tip: Percent error helps to understand how accurate a measurement is compared to the accepted value.