Fire is the rapid oxidation of a material in the exothermic chemical process of combustion, releasing heat, light, and various reaction products. Slower oxidative processes like rusting or digestion are not included by this definition.
The flame is the visible portion of the fire. If hot enough, the gases may become ionized to produce plasma. Depending on the substances alight, and any impurities outside, the color of the flame and the fire's intensity will be different.
Fire in its most common form can result in conflagration, which has the potential to cause physical damage through burning. Fire is an important process that affects ecological systems across the globe. The positive effects of fire include stimulating growth and maintaining various ecological systems. Fire has been used by humans for cooking, generating heat, signaling, and propulsion purposes. The negative effects of fire include water contamination, soil erosion, atmospheric pollution and hazard to human and animal life.
Famous quotes containing the word fire:
“When did your sparkle turn to fire and your warmth become desire?”
—Alan Jay Lerner (19181986)
“O charitable philosopher, I beg you to help me. My mind is weak but my soul is strong. Kindle that soul, and the sacred fire shall never be extinguished.”
—James Boswell (17401795)
“Now the appearance of the glory of the LORD was like a devouring fire on the top of the mountain in the sight of the people of Israel.”
—Bible: Hebrew, Exodus 24:17.