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![Thus, at the beginning of the Christian era, the Hellenistic
scientist and engineer Heron of Alexandria describes devices
that use the power of steam to automatically open the doors of
a temple or operate a small turnstile. In the 17th century, people began to understand the concepts
of vacuum or atmospheric pressure and the behavior of gases.
And soon there was an attempt to use the power of the vacuum
to harvest energy.](https://static.wixstatic.com/media/dc2877_96371e3aa86f434184e06af3c3cfd18f~mv2.gif)
![The first attempt concerned a system to pump water out of the
mines. Vapor was introduced into a tank and allowed to cool
until it condensed. This created a negative pressure inside, through which the pit
water could be sucked in through a pipe. There was a system of
pipes, valves, and tanks, and sometimes they used to explode.
Everything worked systematically, but it wasn't very efficient.](https://static.wixstatic.com/media/dc2877_f84b987234b44933aac0094418c188b6~mv2.gif)
হাইলাইট
From the Editor - Ruchika Rawan
Important Inventions in the World
of Cars
The Invention Of Heels
The Inventions that have changed the world!
Luxury of the month - Rolls-Royce Wraith
The Invention Of Salons
Top 10 cars for 50 crores for the Ultra-rich by Priyanshu Rajput,
The Invention Of Lingerie
Final Look for “her going to the past”
Concept of the month - Saab Aero X
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