# π 'N' Science | Summary and Q&A

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March 14, 2013
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SciShow
π 'N' Science

## TL;DR

Pi is a constant ratio used in various scientific calculations, from measuring circular orbits to understanding the behavior of DNA molecules.

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### Q: What is pi and why is it important in mathematics and science?

Pi, represented by the symbol π, is the ratio of a circle's circumference to its diameter. It is a fundamental constant used in mathematical equations and scientific calculations involving circular objects or phenomena.

### Q: How is pi used to measure and predict the behavior of objects in space?

Pi is essential in determining the circumference, area, surface area, and volume of circular objects, such as artificial satellites in orbit or planets passing in front of stars. By multiplying the radius by 2π, scientists can easily calculate these measurements.

### Q: Does pi have applications beyond astronomy?

Yes, pi is used in various measurements in nature. For instance, in biology, the length of a DNA molecule is expressed as 1.5π times shorter when it's bundled up inside cells. Furthermore, pi even appears in Einstein's formula for SpaceTime curvature, showing its relevance in physics.

### Q: Is there any debate about the value of pi in mathematics?

Some mathematicians argue that the real "magic number" should not be pi alone, but rather 2π or about 6.28. They believe that 2π is more appropriate since the defining feature of a circle is its radius, not its diameter. This perspective suggests using a new constant, the ratio of a circle's circumference to its radius.

## Summary & Key Takeaways

• Pi represents the ratio of a circle's circumference to its diameter and is used in a wide range of scientific calculations.

• Scientists utilize pi to measure, study, and predict the behavior of circular objects or phenomena, such as artificial satellites in orbit or planets passing in front of stars.

• Pi is not only applicable in astronomy but also in the measurement of natural curves, electromagnetic waves, and even Einstein's formula for SpaceTime curvature.