Hydrogen sulfide

Hydrogen sulfide is the chemical compound with the formula H
2S. It is a colorless gas with the characteristic foul odor of rotten eggs; it is heavier than air, very poisonous, corrosive, flammable, and explosive.

Hydrogen sulfide often results from the bacterial breakdown of organic matter in the absence of oxygen gas, such as in swamps and sewers; this process is commonly known as anaerobic digestion. H
2S also occurs in volcanic gases, natural gas, and in some sources of well water. It is also present in natural halite type rock salts, most notably in Himalayan Black Salt, which is mostly harvested from the mineral-rich Salt Range mountains of Pakistan. The human body produces small amounts of H
2S and uses it as a signaling molecule.

Dissolved in water, hydrogen sulfide is known as hydrosulfuric acid or sulfhydric acid, a weak acid.

Swedish chemist Carl Wilhelm Scheele is credited with having discovered hydrogen sulfide in 1777.

The British English spelling of this compound is hydrogen sulphide, but this spelling is not recommended by the International Union of Pure and Applied Chemistry or the Royal Society of Chemistry.

Hydrogen

Hydrogen is a chemical element with chemical symbol H and atomic number 1. With an atomic weight of 7000100794000000000♠1.00794 u, hydrogen is the lightest element on the periodic table. Its monatomic form (H) is the most abundant chemical substance in the Universe, constituting roughly 75% of all baryonic mass. Non-remnant stars are mainly composed of hydrogen in its plasma state. The most common isotope of hydrogen, termed protium (name rarely used, symbol ¹H), has one proton and no neutrons.

The universal emergence of atomic hydrogen first occurred during the recombination epoch. At standard temperature and pressure, hydrogen is a colorless, odorless, tasteless, non-toxic, nonmetallic, highly combustible diatomic gas with the molecular formula H₂. Since hydrogen readily forms covalent compounds with most non-metallic elements, most of the hydrogen on Earth exists in molecular forms such as in the form of water or organic compounds. Hydrogen plays a particularly important role in acid–base reactions as many acid-base reactions involve the exchange of protons between soluble molecules. In ionic compounds, hydrogen can take the form of a negative charge (i.e., anion) when it is known as a hydride, or as a positively charged (i.e., cation) species denoted by the symbol H⁺. The hydrogen cation is written as though composed of a bare proton, but in reality, hydrogen cations in ionic compounds are always more complex species than that would suggest. As the only neutral atom for which the Schrödinger equation can be solved analytically, study of the energetics and bonding of the hydrogen atom has played a key role in the development of quantum mechanics.

H2S

H2S may refer to:

Safety Training

"Safety Training" is the twentieth episode of the third season of the American comedy television series The Office. Written by B. J. Novak, who also acts in the show as sales representative Ryan Howard, and directed by Caddyshack and National Lampoon's Vacation director Harold Ramis, the episode aired in the United States on April 12, 2007 on NBC.

In the episode, Michael attempts to prove life in an office is dangerous after Darryl berates him about the dangers of the warehouse. The attempts lead him to the roof of the building, where he tries to show that depression caused by an office can lead to desperate circumstances. Meanwhile, gambling between the other employees of the office leads Karen to discover that she is still an outsider.

Plot

When Michael Scott (Steve Carell) repeatedly disrupts Darryl Philbin's (Craig Robinson) warehouse safety training session, Lonny Collins (Patrice O'Neal) and Darryl mock the office workers' safety session in retaliation, claiming that office work does not entail physical danger. Offended by Darryl's disdain for office safety training, Michael decides to demonstrate the risk of depression and suicide by jumping off the roof, landing on a hidden trampoline. When Michael tests out the trampoline by dropping a watermelon from the roof, it bounces off and hits an office worker's car, prompting it to be replaced by a bouncy castle hidden from the general view of the parking lot. From the roof of the building, Michael talks dramatically about the dangers of depression. When the bouncy castle is discovered, Jim and Pam realize that Michael is "going to kill himself pretending to kill himself." The employees collectively talk Michael down from the roof, with Darryl doing most of the talking, to assure Michael that he is brave simply by living as himself. At the end, the car that was hit by the watermelon is revealed to be Stanley's (Leslie David Baker), who is shocked to see the mess.