The given expression is \( 6.45 \times 10^5 \, \text{cal} \).

This is simply a number written in scientific notation. To expand it:

\[
6.45 \times 10^5 \, \text{cal} = 645,000 \, \text{cal}
\]

So, \( 6.45 \times 10^5 \, \text{cal} \) equals 645,000 calories.

Would you like further details or clarification on this?

Here are some related questions:
1. How do you convert calories to joules?
2. What is the difference between small calories and kilocalories?
3. How do you convert calories into watts (power)?
4. How can you express \( 6.45 \times 10^5 \, \text{cal} \) in kilocalories?
5. What is the scientific notation and how is it used in calculations?

**Tip:** When dealing with large numbers, scientific notation makes calculations easier by simplifying their expression.

Learn how to expand the scientific notation 6.45x10^5 cal into standard form, resulting in 645,000 cal. This page covers scientific notation, energy conversion, and provides further details on related topics like converting calories to joules and kilocalories. Suitable for Grades 8-10.

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