Arsine, with the chemical formula AsH3, is a highly toxic and flammable gas. It is a compound composed of arsenic (As) and hydrogen (H) atoms. Arsine is colorless, but it has a characteristic garlic-like odor, which can be detected even at low concentrations.

Arsine is extremely toxic and poses serious health risks if inhaled or absorbed through the skin. It is a potent poison that can cause severe health effects, and exposure to even small amounts can be fatal. Arsine is considered one of the most toxic and dangerous gases encountered in the laboratory and industrial settings.

Some key properties and uses of arsine include:

1. Semiconductor Manufacturing: Arsine is used in the semiconductor industry for certain processes, such as the epitaxial growth of compound semiconductors.
2. Chemical Synthesis: Arsine is used as a reagent in some chemical synthesis reactions.

Due to its extreme toxicity, arsine requires the utmost caution and special safety measures when handling or working with it. Proper ventilation, use of personal protective equipment, and working with arsine in a well-equipped and controlled environment are essential to prevent exposure and protect the health and safety of workers.

It is important to note that arsine is not used in common industrial or household applications due to its high toxicity. Instead, it is utilized in specialized processes where its unique properties are necessary, such as in certain semiconductor manufacturing steps.