A cold is caused by one of many different viruses, some of which are airborne, but most are transmitted by hand-to-nose contact. Once the virus is absorbed by the nose, it causes the body to release histamine, a chemical which dramatically increases blood flow to the nose and causes nasal tissue to swell. This inflames the nasal membranes which become congested with blood and produce excessive amounts of mucus that stuffs up the nasal airway.
Biomass Energy. Biomass is organic material which has stored sunlight in the form of chemical energy. Biomass fuels include wood, wood waste, straw, manure, sugar cane, and many other byproducts from a variety of agricultural processes. Biomass is a renewable energy source because the energy it contains comes from the sun.
Food, biomass, fuel and explosives have a store of chemical energy. The energy from food is released by chemical reactions in our bodies in the form of heat. Fuels like coal, oil and natural gas contain chemical energy that may be converted into other forms of energy like heat and light.n this lesson, we are going to look at the forms that energy exists, namely: heat, light, sound, electrical, chemical, nuclear and mechanical. These forms of energy may be transformed from one form to the other, usually with losses.