Daylight Hours: 9 hours, 11 minutes (-8m 42s). The Sun's altitude in Tromsoe tromsÃ¸. Today the horizontal line signifies the, horizon the vertical lines show the times of sunrise and. Sunset altitude and heading are displayed in the box on the. right
Hydrogen cyanide (HCN), sometimes called prussic acid, is an organic compound with the chemical formula HCN. It is a colorless, extremely poisonous and flammable liquid that boils slightly above room temperature, at 25.6 Â°C (78.1 Â°F).
A halon system is a type of gaseous fire suppression system which operates with halon gas. In the 1980s, halon was recognized as an ozone-depleting compound, and production of additional halon was largely banned.alon was introduced in the 1960s as a form of gaseous fire suppression, and it also has a history of use as a refrigerant. In a halon system, pressurized tanks of the gas are connected to a series of pipes and nozzles. When a fire is detected, the gas is released.