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by Mr. Cedrick Koelpin Published 2 years ago Updated 2 years ago
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What is mean by H symbol?

Hydrogen, symbol H, a chemical element.

How to spell out H?

Its name in English is aitch (pronounced /ˈeɪtʃ/, plural aitches), or regionally haitch /ˈheɪtʃ/....HWriting systemLatin scriptTypeAlphabeticLanguage of originLatin languagePhonetic usage[h] [x] [ħ] [0̸] [ɦ] [ɥ] [ʜ] [ʔ] [◌ʰ] [ç] /eɪtʃ/ /heɪtʃ/15 more rows

How old is the letter H?

The earliest form of the letter appears on the Moabite Stone, dating from the 9th century bce. Early Greek forms gave way to intermediate Greek and Latin renditions that were virtually identical to the modern B.

What is H in ancient Greek?

Heta is a conventional name for the historical Greek alphabet letter Eta (Η) and several of its variants, when used in their original function of denoting the consonant /h/.

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 say h in English?

4:076:51How to pronounce 'H' in English -- not 'A' or 'R'! - YouTubeYouTubeStart of suggested clipEnd of suggested clipHair if you don't say the H sound it sounds like air. When you want to say the EH sound you put yourMoreHair if you don't say the H sound it sounds like air. When you want to say the EH sound you put your mouth back air with the H sound hair your mouth has to be open to begin with.

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.

How do you write H in handwriting?

0:171:07Handwriting Video for Kids - How to Write the Letter 'h' - YouTubeYouTubeStart of suggested clipEnd of suggested clipAnd once again start at the top and draw a long line down from that point draw an arch. Now it'sMoreAnd once again start at the top and draw a long line down from that point draw an arch. Now it's your turn use your pointer finger and follow with. Me let's try that again. You have made the letter h.

How do you write H in 4 lines?

0:151:50Write the Letter H - Alphabet Handwriting by 123ABCtv - YouTubeYouTubeStart of suggested clipEnd of suggested clipWe'll start with uppercase or big h to write uppercase h we'll start at the top. And do a straightMoreWe'll start with uppercase or big h to write uppercase h we'll start at the top. And do a straight line down then go back to the top.

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.

Do Greeks pronounce H?

Greek does not have a letter "H," but it does have an "H" sound. The sound can be found in three "double letters": theta, chi, phi (th, ch, and ph). The other place where the "H" sound can be found is at the beginning of words that begin with a vowel.

Does Greek alphabet have an H?

The standard Greek alphabet doesn't include a separate letter for the H sound, even though many dialects of Greek had the sound. Instead two small marks called "breathing marks" are used.

Which is correct aitch or 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 it an H or ah?

For the letter “H”, the pronunciation dictates the indefinite article: Use “a” before words where you pronounce the letter “H” such as “a hat,” “a house” or “a happy cat.” Use “an” before words where you don't pronounce the letter “H” such as “an herb,” “an hour,” or “an honorable man.”

How do you say hi?

0:512:3010 DIFFERENT WAYS TO SAY 'HI' OR 'HELLO' IN ENGLISH! *vocabularyYouTubeStart of suggested clipEnd of suggested clipOne is hello hello can be used in a variety of different situations. This should be your go-to whenMoreOne is hello hello can be used in a variety of different situations. This should be your go-to when you're answering the phone hello.

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.

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…

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