So, Negative Gravity Is a Thing

TL;DR

Sound waves, known as phonons, have negative gravity and can move upward due to differences in air pressure caused by denser fluids. This behavior has potential implications for objects like neutron stars.

Transcript

Thanks to Brilliant for supporting this episode of SciShow. Go to Brilliant.org/SciShow to learn more. [♪ INTRO] In nature, most of our basic forces both attract and repel. In fact, gravity is the only exception. As far as we can tell, anything gravity acts on just goes one way: down. As long as there’s no other forces involved, anyway. But there i... Read More

Key Insights

• 🤔 Sound waves, or phonons, can be thought of as particles that move upward in a gravitational field.
• 👋 The upward movement of sound waves is caused by differences in air pressure due to the density of the fluid they are passing through.
• 👋 Negative gravity in sound waves has potential implications for objects like neutron stars, where sound waves travel through super-dense fluids.
• 💆 The effects of negative gravity on objects with mass, including particles and objects, have not yet been measured due to the weak nature of gravity on a microscopic level.
• 🦾 This phenomenon is based on classical physics and does not require quantum mechanics or general relativity to understand.
• 👋 The predicted curving of sound waves over large distances is too small to be detected with existing instruments.
• 🤗 The understanding of negative gravity in sound waves opens up new possibilities for studying the behavior of objects in extreme conditions.

Questions & Answers

Q: How are sound waves able to defy gravity and move upwards?

Sound waves, or phonons, are able to move upward due to differences in air pressure caused by the density of the fluid they are passing through. This difference in pressure causes the bottom of the sound wave to travel faster, resulting in a slight upward bending of the wave.

Q: Can this phenomenon of negative gravity be observed in everyday life?

The effect of negative gravity in sound waves is so small that it cannot be detected in everyday life. It would require extremely sensitive instruments to measure the predicted curving of sound waves over large distances.

Q: What implications does negative gravity in sound waves have for objects like neutron stars?

Scientists believe that in objects like neutron stars, where sound waves travel through super-dense fluids, phonons with negative gravity could significantly affect the behavior of the star. However, further research is needed to fully understand this impact.

Q: How does negative gravity in sound waves affect objects with mass?

Since phonons have negative mass, they also have negative gravity. This means that sound waves should push away anything with mass, including particles and objects. However, the effects of negative gravity on objects with mass have not yet been measured due to the weak nature of gravity on a microscopic level.

Summary & Key Takeaways

• Sound waves, which are vibrations of molecules, can be thought of as particles called phonons.

• Phonons move upward in a gravitational field due to the differences in air pressure caused by the density of the fluid.

• This phenomenon could have implications for objects like neutron stars, where sound waves travel through super-dense fluids.