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 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
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/.
Is H silent in John?
I have always wondered this since I was little, and nobody seems to have asked or answered this before anywhere on the internet. What is the origin of the 'h', and why is it still with us? bad joke - Because the silent 'h' in John stands for hooker.
Is H the 8th letter?
h, eighth letter of the alphabet.
What are H words?
List of positive words that start with HHappyHumbleHeartfeltHumaneHarmonyHoorayHaleHeartyHealthyHelpfulHolyHopefulHonorableHallowedHard-working3 more rows
How is H pronounced?
So, h pronunciation - you make the h sound with the tongue low in your mouth and the lips apart and the vocal folds approximating to create a hiss-like breath. This is a voiceless sound. This is how you pronounce the letter h.
How do you write big H?
0:151:50ABC Writing for Kids - 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 omicron mean in Latin?
little OLetters that arose from omicron include Roman O and Cyrillic O. The word literally means "little O" (o mikron) as opposed to "great O" (ō mega).
What does omicron mean in Greek?
little o“Omicron is the Greek for 'little o' (o mikron) as opposed to omega meaning 'great/big o'.
What does the letter H look like?
0:163:52Learn The Letter H | Let's Learn About The Alphabet | Phonics Song for KidsYouTubeStart of suggested clipEnd of suggested clipLet's learn about the letter h h is a letter h is a letter h is a letter h is a letter in theMoreLet's learn about the letter h h is a letter h is a letter h is a letter h is a letter in the alphabet. This is an uppercase h write it in the air.
What is special about letter H?
Though it's a high-value letter in Scrabble and Words with Friends, H is a relatively common letter. Statistically speaking, it is the eighth most commonly used letter in the English language. That's because H is usually paired with other consonants like wh, ch, sh, and gh.
When was the letter J invented?
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 was the letter S invented?
The long s can be traced back to Roman times, when the lowercase s typical took an elongated form in cursive writing (opens in new tab) in Latin. According to librarians at the New York Academy of Medicine (opens in new tab), people were using the long s at the beginning and middle of words by the 12th century.
Who created the 22 letter alphabet?
PhoenicianWritten from right to left and spread by Phoenician maritime merchants who occupied part of modern Lebanon, Syria and Israel, this consonantal alphabet—also known as an abjad—consisted of 22 symbols simple enough for ordinary traders to learn and draw, making its use much more accessible and widespread.
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…