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Who Discovered Hydrogen?

Who Discovered Hydrogen?
Known as an odorless, colorless and nonmetallic flammable gas, hydrogen is one of the most abundant elements in the universe. This element is important to the formation of stars belonging in the main sequence. However, the gas is very rare in our planet. The chemical element has various industrial uses. Moreover, the element is important to the discovery of the atomic structure. To learn more about this element, it is best if we start with the history of the discovery of hydrogen. Historical Background Who discovered hydrogen? Henry Cavendish discovered the element in 1776. He found out that various elements including hydrogen composed water. Cavendish also discovered the gas from a certain metal-acid experiment that he performed. Antoine Lavoisier named the gas hydrogen in 1783 when he and Pierre-Simon Laplace proved the findings of Cavendish that water could be produced when the gas is burned. The element was first liquefied in 1898 by James Dewar. He did this with the use of a vacuum...

Who Discovered the Pythagorean Theorem?

Who Discovered the Pythagorean Theorem?
From the studies that you, perhaps, have learned in school, the person credited to be the one who discovered the Pythagorean Theorem is the Greek philosopher, Pythagoras. However, there are some who say that this is not so. If you were to study the history of the theorem, you may see that it may not be Pythagoras after all who discovered the Pythagorean Theorem. The Early History Accounts of the Theorem In Northern Europe and Egypt during 2500 BC, there were some accounts pointing to an algebraic discovery of the Pytha gorean triples as expressed by Bartel Leendert van der Waerden. It was used in megalithic monuments during that time which had right triangles with integers as its sides. There were also written accounts during 2000 and 1786 BC which includes an Egyptian papyrus bearing a Pythagorean triple solution. During the circa 1750 and 1790 BC, a Mesopotamian tablet also contained many written entries which were similar to Pythagorean triples during Hammurabi the Great’s reign. India...

Who Discovered the Constellation Aquarius?

Who Discovered the Constellation Aquarius?
Introduction The constellation Aquarius is one of the twelve signs of the zodiac. It is located in a region of the sky known as the Sea, called thus because of many water-related constellations in the area. These include Pisces (fish), Cetus (whale) and Eridanus (river). Aquarius itself is the sign of the Water Bearer. People often mistake it for a “watery” sign because of the use of water in its symbolism. According to astrologers, Aquarius is not a water sign but an air sign. It comes after Capricorn and before Pisces. Its ruling planets are Saturn and Uranus. The word “aquarius” means “cup bearer. Discovery and History of Aquarius Babylonian astronomers probably discovered the constellation Aquarius. They listed the constellation as marking the autumn equinox in September in 4000 BC. Aquarius is also featured in the star catalogues of Ptolemy, Eudoxos and Aratus. Ancient people visualized Aquarius as a man bearing a vessel of water and pouring it downwards. This is how it came...

Who Discovered the Constellation Pisces?

Who Discovered the Constellation Pisces?
Introduction Pisces is constellation of the twelfth and last of the zodiac signs. It is found in that region of the sky known as the Sea. Near Pisces are several other constellations with water symbolism, including the Whale and Aquarius, the eleventh zodiac sign. Unlike other constellations like Orion and Leo, Pisces is difficult to observe since it is very faint. This constellation is visualized as two fishes. It is what the word “Pisces” means in Latin. There is supposed to be a cord joining the two fishes by their tails. The two creatures are swimming in opposite directions. Discovery and History of Pisces Who discovered the constellation Pisces? Well, the Babylonians were the foremost astronomers and astrologers in the ancient world. It is from them that many other constellations have come down to us. Pisces was most likely another one of their discoveries. But the best account we have of the ancients’ view on Pisces comes from the Greeks. The earliest astronomers in Greece did...

Who Discovered Calcium?

Who Discovered Calcium?
Most people probably know that Calcium is part of the Periodic Table of the Elements with the other crucial substances. Perhaps, they also know other things about calcium such as: The atomic number is twenty, the symbol used in the table is Ca, and its atomic weight is at 40.078. But if someone would ask who discovered calcium, not many people would immediately have the answer for that. The Existence of Calcium Way Back Then According to history, calcium was already known during the early times – particularly, during the first century when Ancient Romans roamed and lived in the land. It was considered then as a particular component in the preparation of lime as an element called as calcium oxide. In those days, lime was called as calx. The Isolation Process and the Discovery of Calcium It was only during the year of 1808 did calcium get isolated and taken as a particular element in itself. And the person who discovered calcium was Englishman Sir Humphrey Davy. Davy was able to discover...