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Science – Revisiting a famous tale


By Gail Murzello and Xuan


We all know a tiny speck of sand will sink when dropped into water. It makes sense to think that rocks from natural substances composed of solid crystals of different minerals that have been fused together into a solid lump, would naturally sink.


Literature analysis: Ramayana


Fig 1: Ram Sethu is believed to have been built by Lord Rama's army to cross the sea as written in the Ramayana


Ramayana is a famous story not only in India but also in many parts of Asia, such as Thailand, Indonesia, Cambodia, Malaysia and Singapore.


Ramayana is a tale about how Prince Rama led an army of monkey-soldiers across a bridge made of stones to defeat a demon who had captured his wife. It is said that the monkey soldiers threw stones in the ocean after the Prince made a prayer before they built this bridge. Today, the bridge is known as the Rama-Setu or Adam’s bridge. If you are not familiar with this story, the following animation may help you understand the story a bit better: https://www.youtube.com/watch?v=pp59n0So-XE


Ram Setu/Adam’s Bridge

Fig 2: Rama Setu/Adam’s bridge taken from Google Map


Geographical facts:

The distance between the end of Rameshwaran, Pamban island in Tamil Nadu and Sri Lanka’s Mannar Island is roughly 30 miles (48 km) long and 1- 10 metres deep. This bridge was reportedly passable on foot up to the 15th century. Temple records seem to suggest that the Ram-Setu bridge remained above sea level till a cyclone happened in 1480 (1).


Scientific inquiry:

For the sake of scientific discussion, we assume that the events of Ramayana are true and that there was such a prince who wanted to save his wife. Let’s look at the possibility of that happening.


1. Floating bridge or not?

Those who have visited Rameshwaran temple would be familiar with this stone. When you push it down, it floats up.


Fig 3: This stone weighs a lot but amazingly they float in the water.


There are some stones that float in water. One such stone is the pumice rock. Could the bridge possibly be built from such rocks?

Pumice rocks are a product of volcanic eruptions. They are lightweight and porous -trapping pockets of gas hence making them capable of floating in water(2).


It’s true — some rocks can float on water for years at a time. However, they will eventually sink like how a sponge (3) does when it absorbs water. According to the story, Prince Rama and his entourage made both their trips using the same bridge. It is a safe assumption that during those days of fighting to rescue Rama’s wife, the rocks did not sink, ensuring the safe return of the prince, his wife and his entire army.


To build such a floating bridge, the soldiers would have needed enough pumice rocks to form at least a 30km bridge. The rocks to build the bridge may not have been tightly packed and would have gaps between them and soldiers would jump to the end. This could be to minimize the number of rocks used or maybe they just did not have sufficient rocks to build such a long bridge.


2. Where did this pumice rock come from? Are there volcanoes in India?


There are a total of 7 volcanoes in India. Ruling out those in Haryana, Maharashtra and Gujarat, there are 4 volcanoes left. These volcanoes are situated in the Andaman Sea area, namely Narcondam, Barren and Baratang island. Given their close proximity to India, it could very well float to Rameshwaran.

Fig 4: Picture of a current direction in Winter (Dec – Feb)


Given the direction of the currents seen above, there is a possibility that the currents could have swept these pumice rocks from the volcano in the Andaman sea to the shores of Rameshwaran before Prince Rama’s arrival in that area.


3. Could the bridge handle all that weight?


Can pumice rock support the weight of a man? We know according to the story that the princes had been living in the forest for around 10-14 years feeding solely off fruits and vegetables. According to NBC(4) news, vegans have the lowest BMI. Assuming that the two princes were light and slim, could the huge pumice stones withstand their weight? As the rest of the soldiers were monkeys, they could undoubtedly cross where the men could as they would weigh much less.


Are there other materials or engineering techniques that Prince Rama and his companions could have employed in this famous chapter of the Ramayana?



References:


218 views11 comments

11 Comments


Pretty detailed and well explained.

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Sivakumar Gopalan
Sivakumar Gopalan
Dec 21, 2021

A wonderful write up that definitely instills more curiosity to explore more about pumice rocks, its properties and ofcourse to revisit the great epic. A great start. More such evidences of our ancient epics and culture will definitely help the readers to think about our great past. A humble thought, probably can add more mathematical evidences or a mathematical modelling of the bridge to reenforce the engineering feat and further strengthen the argument. Its good that you touched upon BMI. Probably a mathematical calculation assuming the total BMI of a monkey army and whether the rocks can withstand such weight can help to add the mathematical angle to it.

Keep writing more, exploring more. way to go.

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Linyx
Linyx
Dec 22, 2021
Replying to

Thank you Siva for the feedback. I wouldn't think about the equational modelling that of the bridge. I shall wait for some engineer to enlighten me. Regarding the BMI, I could safely say that Rama and Lakshmana must be on the lean side. After all, they live on fruits and vegetables. I bet they are very agile too to jump from 1 pumice rock to another to the end. Love Conquers ALL!

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pearlinecfl
pearlinecfl
Dec 21, 2021

A great write up between geography, science and literature. Because of this write up, I want to find out more about the story of Lord Rama. Truly appreciate and hope to see more of such write up that ignite deep thoughts.

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Linyx
Linyx
Dec 22, 2021
Replying to

Thank you Pearline! I certainly didn't come up with this idea. It was a random thought about the pumice stone that Jon and I been talking about over dinner a couple of times. Yet amazingly, it fits into this website perfectly!

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Good and excellent work. I still remember my grandma stories the monkey army had experts to identify the stones that can float in water. These stones were inscribed with Rama nama.

This science could be of great wealth for us to built tsunami resistant buildings

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Linyx
Linyx
Dec 22, 2021
Replying to

To use this for a tsunami resistant building! That is an interesting thought! Who knows, this could save lives!

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Hans Kerkhofs
Hans Kerkhofs
Dec 20, 2021

What a beautiful story, and nice to learn this bridge is a small part of the bigger story about Ram and Sita. The science part is also really cool, never thought of floating stones :) thanks for sharing!

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Linyx
Linyx
Dec 22, 2021
Replying to

You are are very welcome! Thank you very much for the Math book you gave me a year ago. It will come in very handy!

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