Hydrogen sulfide

Chemical formula H2S, also known as sulfane, dihydrogen sulfide and sulfur hydride. It is an inorganic, colorless, weakly acidic, flammable, highly toxic gas that smells like rotten eggs. It is found in trace amounts in farts which is why they smell so bad sometimes. These amounts are too small to cause any harm, as hydrogen sulfide can already be detected by the human nose at concentrations below 0.1 ppm. The famous chemist Carl Wilhelm Scheele was the first to discover and isolate the gas in 1777. The gas can be created by reacting iron sulfide aka pyrite with hydrochloric acid (any concentration). This should however, never be done even by experienced chemists. The gas is highly toxic and even in presence of a fume hood, harmful concentrations could still escape, and the gas wont really escape quickly from the lab as its slightly heavier than air. Also, even if the concentration was not harmful, who wants their laboratory to stink like farts? Nobody. Also it could minimally interfere with reactions. So please don't make hydrogen sulfide. Now, does hydrogen sulfide have any uses? Well, not really. It's only useful in chemistry and making some reagants, but other than that, it plays no role in everyday life.

Max: We accidentally made hydrogen sulfide and had to evacuate the entire lab....
Thomas: Seriously mate?

by LegacyFilet July 7, 2024

Hydrogen

The first element on the periodic table. Hydrogen without any neutrons is sometimes called protium; with one neutron, deuterium; with two, tritium.

Basic Information:
| Name: Hydrogen
| Symbol: H
| Number: 1
| State at STP: Gas
| Melting / Freezing Point: 14 K
| Boiling Point: 20 K

Two hydrogen atoms and one oxygen atom make a water molecule.

by Wilfredlam0418 December 20, 2024

Hydroboi

a shitty eagles fan who happens to make beats n shi.
he cool i guess but he do be weird sometimes.

"Hydro do you like pizza?"
Hydroboi -"it makes me shit really bad."
its telling me to define the word i just did bruh he makes beats and he say gay shit

by ykwhodisisbruh January 22, 2025

Hydromacy

Hydromacy (noun) hahy-DROH-muh-see:
The practice of political and diplomatic negotiations concerning water resources and hydropower, particularly between nations or regions, with the goal of cooperation, conflict resolution, and sustainable management.

"Hydromacy has become a key aspect of international relations as countries negotiate water-sharing agreements."

"Nepal's hydromacy strategy must balance energy production and regional cooperation with its neighbors."

by Raj Thanju January 30, 2025

Hydro-erotic Asphyxiation

Like auto-erotica asphyxiation, except performed in a public restroom, by plunging your head into the toilet whilst vigorously master bating ones self.

A man was found almost drowned in the Wafflehouse men's room, covered in toilet water and semen. A victim od his own Hydro-erotic Asphyxiation.

by Clownboy1969 January 31, 2025

Hydroerotic Asphyxiation

Hydroerotic Asphyxiation - is a form of auto erotica asphyxiation. The subject places their head in a public restroom toilet while masterbating to deprive the subject of oxygen hightening the excitement and pleasure of the masterbater's experience.

A man was found half naked and unconscious in a stall of the JC Pennies men's room covered in water and semen with a subtle smile on his face. An obvious victim of Hydroerotic Asphyxiation.

by Clownboy1969 January 31, 2025

Hydrodynamics

The study of fluids (liquids and gases) in motion, and the forces acting upon them. It's the science of flow, pressure, drag, and turbulence, essential for designing everything from submarines and aircraft wings to arterial stents and planetary weather models. In an alien context, it expands to "xenohydrodynamics," modeling how strange fluids—like liquid methane on Titan or supercritical carbon dioxide on Venus—behave under different gravities and temperatures. It answers questions about alien ocean currents, atmospheric circulation, and the design of vehicles meant to navigate non-water seas.

Example: Engineers using Hydrodynamics to design a silent submarine drone for exploring Europa's subsurface ocean must model how its shape interacts with salty water under immense pressure and near-freezing temperatures. An astronomer simulating the hurricane-force methane rivers flowing across Titan's surface is applying hydrodynamic principles to an alien fluid system.

by Abzugal Nammugal Enkigal February 3, 2026