Question

Give two examples each of liquid bio-fuel and gaseous bio-fuel.

Answer 1

Examples of biofuels include ethanol (often made from corn in the United States and sugarcane in Brazil), biodiesel (sourced from vegetable oils and liquid animal fats), green diesel (derived from algae and other plant sources), and biogas (methane derived from animal manure and other digested organic material).

Gaseous fuels may be divided into four classes: natural gas, producer gas, water gas and coal gas. Natural gas exists already formed in the earth, and is obtained by boring tube wells, similar to petroleum wells. Its essential heat producing constituents are methane (CH4) and hydrogen