How many significant figures are there for 2.1390?

The number \(2.1390\) has **five significant figures**. 

Here’s why:
- All non-zero digits are always significant.
- Any zeros between non-zero digits are significant.
- Any trailing zeros after a decimal point are significant, as they indicate precision in the measurement.

In \(2.1390\):
- The digits \(2\), \(1\), \(3\), and \(9\) are all significant.
- The trailing zero is also significant because it is after the decimal point.

Would you like further details or have any questions? 

Here are some related questions:

1. How many significant figures are in \(0.004520\)?
2. What are the rules for determining significant figures?
3. How do significant figures affect the accuracy of a calculation?
4. Why is the number of significant figures important in scientific measurements?
5. How do you round a number to a certain number of significant figures?

**Tip:** When performing calculations, the result should be reported with the same number of significant figures as the measurement with the fewest significant figures.

Explore the concept of significant figures and learn how to determine them for numbers like 2.1390. This detailed explanation covers the rules for identifying significant figures in scientific measurements, emphasizing their importance in precision calculations. Suitable for high school students and anyone interested in scientific accuracy.

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