Historically, "flammable", "inflammable" and "combustible" meant "capable of burning". The word "inflammable" may be erroneously thought to mean "non-flammable". Electrical knifes should not be used around inflammable substances, like alcohol-based disinfectants. Oil Creek had flooded and inflammable material on the water had ignited and exploded. The main component of fireworks is gunpowder, which is an inflammable and explosive product. The house gets blown up, signing the storage of inflammable explosives. Like other organic compounds, polystyrene is inflammable. In 1766, English chemist Henry Cavendish isolated hydrogen, which he called "inflammable air". Calcium formate is stable at room temperature, is inflammable and forms orthorhombic crystals. More than 180,000 grenades and inflammable shells were fired on the city itself. The erroneous usage of the word "inflammable" is a significant safety hazard. He is noted for his discovery of hydrogen, which he termed "inflammable air". What was inflammable has been burnt to ashes; what is left is deathless. Other times, girls smoking in a basement closet near inflammable materials came under scrutiny. From the pine and the certain such evergreen trees inflammable resin is collected.