What is mean by H symbol?
HydrogenHydrogen, symbol H, a chemical element.
How old is the letter H?
The letter 'H' came from the Egyptians and used as a symbol for fence. It made a breathy sound when pronounced so early academicians thought that it was not necessary and the British and Latin scholars eventually dropped the letter H from the English alphabet by around 500 AD.
How do you spell H phonetically?
Name in English For most English speakers, the name for the letter is pronounced as /eɪtʃ/ and spelled "aitch" or occasionally "eitch".
Why is H pronounced aitch?
The earlier Latin pronunciation is uncertain. And the name “aitch” for “h,” the OED says, goes back through the Middle English ache to the Old French and Spanish ache, then probably to the late Latin accha, ahha, or aha. The earlier Latin name was ha and the Greek name was heta.
What letter is 0 in the alphabet?
O, or o, is the fifteenth letter in the ISO basic Latin alphabet and the fourth vowel letter in the modern English alphabet. Its name in English is o (pronounced /ˈoʊ/), plural oes.
What does H mean in Greek?
h, eighth letter of the alphabet. It corresponds to Semitic cheth and Greek eta (Η).
How do you say H in America?
0:063:35English: How to Pronounce the H consonant: American AccentYouTubeStart of suggested clipEnd of suggested clipThe H consonant sound this sound is simply made by passing air through the mouth. If you hear soundsMoreThe H consonant sound this sound is simply made by passing air through the mouth. If you hear sounds like that. And you feel the soft palate bouncing against the tongue.
How do you say H in British English?
0:070:58The Letter H - RP British Accent Pronunciation practice - YouTubeYouTubeStart of suggested clipEnd of suggested clipQuestion how do I pronounce the letter H is it H or H. The correct pronunciation of H is H.MoreQuestion how do I pronounce the letter H is it H or H. The correct pronunciation of H is H.
How do you write H?
1:242:16Alphabet Writing lesson for children | The Singing Walrus - YouTubeYouTubeStart of suggested clipEnd of suggested clipLet's try it again down up around and down now you try now check if you did it. Right well done nowMoreLet's try it again down up around and down now you try now check if you did it. Right well done now you know how to write the letter h. Next time we'll write the letter.
How old is the letter J?
Both I and J were used interchangeably by scribes to express the sound of both the vowel and the consonant. It wasn't until 1524 when Gian Giorgio Trissino, an Italian Renaissance grammarian known as the father of the letter J, made a clear distinction between the two sounds.
Is Haitch correct?
First, you won't find 'haitch' in the dictionary, only the correct spelling aitch. The name of the letter comes from Old French ache of the 1500s and first spelt so in English, when it was related to the Old English word ache, from æce. At this time it was pronounced "ache" or "aitch".
How do you spell Z?
0:201:02How to Pronounce Z Letter? (ZED or ZEE) British Vs ... - YouTubeYouTubeStart of suggested clipEnd of suggested clipIn british english the name of this letter is normally said as zed as in z e d zed in americanMoreIn british english the name of this letter is normally said as zed as in z e d zed in american english. However it is normally called z as in z e e z in american english versus zed in british english.
What does H stand for in history?
The word originally entered the language from French as autour, but around the 1500s, scribes started inserting the h and changed it into author. Scribes also put Hs on the beginning of words, even though the Hs remained silent, as in the words honest and historical.
How old is the letter J?
Both I and J were used interchangeably by scribes to express the sound of both the vowel and the consonant. It wasn't until 1524 when Gian Giorgio Trissino, an Italian Renaissance grammarian known as the father of the letter J, made a clear distinction between the two sounds.
When did Aitch become Haitch?
First, you won't find 'haitch' in the dictionary, only the correct spelling aitch. The name of the letter comes from Old French ache of the 1500s and first spelt so in English, when it was related to the Old English word ache, from æce. At this time it was pronounced "ache" or "aitch".
Is H silent in Latin?
h is fully pronounced and never 'silent'. s is always as in "see" and never voiced as in "wise". ch represents Greek Χ χ (chi) and is nearly equal to a hard Latin "c", the only difference being that ch is aspirated (it is pronounced with an additional puff of air).
Overview
H, or h, is the eighth letter in the ISO basic Latin alphabet. Its name in English is aitch , or regionally haitch /ˈheɪtʃ/.
History
The original Semitic letter Heth most likely represented the voiceless pharyngeal fricative (ħ). The form of the letter probably stood for a fence or posts.
The Greek Eta 'Η' in archaic Greek alphabets, before coming to represent a long vowel, /ɛː/, still represented a similar sound, the voiceless glottal fricative /h/. In this context, the letter eta is also known as Heta to underline this fact. Thus, in the Old Italic alphabets, the letter Heta of the Euboe…
Name in English
For most English speakers, the name for the letter is pronounced as /eɪtʃ/ and spelled "aitch" or occasionally "eitch". The pronunciation /heɪtʃ/ and the associated spelling "haitch" is often considered to be h-adding and is considered non-standard in England. It is, however, a feature of Hiberno-English, as well as scattered varieties of Edinburgh, England, and Welsh English, and in Australia and Nova Scotia.
Use in writing systems
In English, ⟨h⟩ occurs as a single-letter grapheme (being either silent or representing the voiceless glottal fricative (/h/) and in various digraphs, such as ⟨ch⟩ /tʃ/, /ʃ/, /k/, or /x/), ⟨gh⟩ (silent, /ɡ/, /k/, /p/, or /f/), ⟨ph⟩ (/f/), ⟨rh⟩ (/r/), ⟨sh⟩ (/ʃ/), ⟨th⟩ (/θ/ or /ð/), ⟨wh⟩ (/hw/ ). The letter is silent in a syllable rime, as in ah, ohm, dahlia, cheetah, pooh-poohed, as well as in certain other words (mostly of French origin) such as hour, honest, herb (in American but not British English) and vehicle (in certain varie…
Related characters
• H with diacritics: Ĥ ĥ Ȟ ȟ Ħ ħ Ḩ ḩ Ⱨ ⱨ ẖ ẖ Ḥ ḥ Ḣ ḣ Ḧ ḧ Ḫ ḫ ꞕ Ꜧ ꜧ
• IPA-specific symbols related to H: ʜ ɦ ʰ ʱ ɥ ᶣ ɧ
• ꟸ: Modifier letter capital H with stroke is used in VoQS to represent faucalized voice.
• ᴴ : Modifier letter H is used in the Uralic Phonetic Alphabet
See also
• American Sign Language grammar
• List of Egyptian hieroglyphs#H
External links
• The dictionary definition of H at Wiktionary
• The dictionary definition of h at Wiktionary
• Lubliner, Coby. 2008. "The Story of H." (essay on origins and uses of the letter "h")
Overview
Hydrogen is the chemical element with the symbol H and atomic number 1. Hydrogen is the lightest element. At standard conditions hydrogen is a gas of diatomic molecules having the formula H2. It is colorless, odorless, tasteless, non-toxic, and highly combustible. Hydrogen is the most abundant chemical substance in the universe, constituting roughly 75% of all normal matter. Stars s…
Properties
Hydrogen gas (dihydrogen or molecular hydrogen) is highly flammable:
2 H2(g) + O2(g) → 2 H2O(l) + 572 kJ/2 mol = 286 kJ/mol = 141.865 MJ/kg)
The enthalpy of combustion is −286 kJ/mol.
Hydrogen gas forms explosive mixtures with air in concentrations from 4–74% and with chlorine at 5–95%. The explosive reactions may be triggered by spark…
History
In 1671, Robert Boyle discovered and described the reaction between iron filings and dilute acids, which results in the production of hydrogen gas. In 1766, Henry Cavendish was the first to recognize hydrogen gas as a discrete substance, by naming the gas from a metal-acid reaction "inflammable air". He speculated that "inflammable air" was in fact identical to the hypothetical substance called "phl…
Cosmic prevalence and distribution
Hydrogen, as atomic H, is the most abundant chemical element in the universe, making up 75 percent of normal matter by mass and more than 90 percent by number of atoms. (Most of the mass of the universe, however, is not in the form of chemical-element type matter, but rather is postulated to occur as yet-undetected forms of mass such as dark matter and dark energy. ) This element …
Production
H 2 is produced in chemistry and biology laboratories, often as a by-product of other reactions; in industry for the hydrogenation of unsaturated substrates; and in nature as a means of expelling reducing equivalents in biochemical reactions.
The electrolysis of water is a simple method of producing hydrogen. A current is run through the water, and gaseous oxygen forms at the anode while gaseous h…
Applications
Large quantities of H 2 are used in the "upgrading" of fossil fuels. Key consumers of H 2 include hydrodealkylation, hydrodesulfurization, and hydrocracking. Many of these reactions can be classified as hydrogenolysis, i.e., the cleavage of bonds to carbon. Illustrative is the separation of sulfur from liquid fossil fuels:
R-S-R + 2 H2 → H2S + 2 RH
Biological reactions
H2 is a product of some types of anaerobic metabolism and is produced by several microorganisms, usually via reactions catalyzed by iron- or nickel-containing enzymes called hydrogenases. These enzymes catalyze the reversible redox reaction between H2 and its component two protons and two electrons. Creation of hydrogen gas occurs in the transfer of reducing equivalents produced during pyruvate fermentation to water. The natural cycle of hydrog…
Safety and precautions
Hydrogen poses a number of hazards to human safety, from potential detonations and fires when mixed with air to being an asphyxiant in its pure, oxygen-free form. In addition, liquid hydrogen is a cryogen and presents dangers (such as frostbite) associated with very cold liquids. Hydrogen dissolves in many metals and in addition to leaking out, may have adverse effects on them, such as hydrogen embrittlement, leading to cracks and explosions. Hydrogen gas leaking into externa…