In thermodynamics, the term exothermic process (exo- : outside) describes a process or reaction that releases energy from the system, usually in the form of heat, but also in a form of light (e.g. a spark, flame, or flash), electricity (e.g. a battery), or sound (e.g. explosion heard when burning hydrogen).n exothermic chemical reactions, the heat that is released by the reaction takes the form of electromagnetic energy. The transition of electrons from one quantum energy level to another causes light to be released.
According to estimates prepared by the National Cancer Institute, as of early 2004, there were 10,800,000 people in America who either have cancer currently or have had it at some point in the past. That's how many people have cancer in the United States. It's a shockingly high number. During 2008, it is estimated that over 1,437,000 new cases of cancer were diagnosed in the country. This number excludes noninvasive cancers except those affecting the urinary bladder.
An estimated 559,312 people die of cancer each year, i.e. one person every minute. Death due to cancer is 22.8% of total deaths in US (higher than WHO global cancer statistics). The lifetime probability of developing cancer in US men is 1 in 2, and in US women is 1 in 3 (highest in the world).n UK, cancer statistics show that one in three people will develop cancer in their lifetime and over one in four people die from cancer. Cancer is the cause of 30% of all the deaths in males and 25% in females. (2007: incidences of cancers in UK).