Does Water Swirl the Other Way in the Southern Hemisphere?

TL;DR

Water swirls in the opposite direction down the drain depending on the hemisphere due to the Coriolis Effect.

Transcript

Derek: A couple of years ago my friend Destin and I wanted to definitively answer the question: does water actually swirl the opposite direction down the drain in the other hemisphere? At the time, I was living in Sydney, Australia, and Destin was in Huntsville, Alabama. Those are about the same latitude, just opposite sides of the Equator, so we c... Read More

Key Insights

• 💦 The direction of water swirls down the drain is determined by the design of the drain, not the hemisphere.
• 🌀 The Coriolis Effect, caused by the Earth's rotation, influences the direction of water swirls in larger systems like hurricanes and cyclones.
• 🎮 Conducting controlled experiments can help eliminate variables and provide clearer results.
• 🚾 The Simpsons episode about toilet flushing in Australia perpetuated the myth of water swirling in the opposite direction down the drain depending on the hemisphere.
• 🖐️ Inconsistent results are observed when observing the direction of toilet and sink drains, indicating that other factors play a role.
• 💦 The Coriolis Effect causes water to move faster towards the equator and slower towards the poles, resulting in swirling motions.
• 💦 The speed and direction of water flow in a drain can be influenced by angular momentum and other sources of motion.

Questions & Answers

Q: Does water actually swirl in the opposite direction down the drain in the other hemisphere?

No, the direction of the water swirl is determined by the design of the drain, not the hemisphere. The Coriolis Effect does play a role in larger systems like hurricanes and cyclones.

Q: Are there consistent results when observing the direction of toilet and sink drains?

No, Derek and Destin found inconsistent results when observing the direction of toilet and sink drains. Some turn counterclockwise while others go clockwise, indicating that it is not influenced by the hemisphere.

Q: What did Derek and Destin discover in their experiment with a kiddie pool?

In their experiment with a kiddie pool, Derek and Destin found that the direction of the water swirl is influenced by the Earth's rotation. In the southern hemisphere, the water flowed clockwise, and in the northern hemisphere, it flowed counterclockwise.

Q: How does the Coriolis Effect impact the direction of water swirls in larger systems?

The Coriolis Effect causes water to swirl counterclockwise in the northern hemisphere, which is why hurricanes swirl in this direction. In the southern hemisphere, cyclones swirl clockwise due to the same effect.

Summary & Key Takeaways

• Derek and Destin set out to determine if water actually swirls in the opposite direction down the drain in the other hemisphere.

• They conducted experiments with a sink, toilet, and kiddie pool, and found that the direction of the swirl is determined by the design of the drain, not the hemisphere.

• The Coriolis Effect, caused by the Earth's rotation, does influence the direction of water swirls in larger systems like hurricanes and cyclones.