Biomass – Renewable organic materials such as wood, agricultural crops or wastes, especially when used as a source of fuel or energy
Note: Biomass can be burned directly or processed into biofuels such as ethanol and methane.
You can buy a mass (biomass) of organic material but you might still have to work on it.
Biomass means "natural material". When biomass energy is burned it releases heat, just like the wood logs in a campfire.
Biomass such as animal waste and organic waste is broken down by micro organisms in light and oxygen-free conditions. This fermentation process produces methane and carbon dioxide (the biogas). The biogas is burned to turn an engine and this turns a spindle between magnets to generate electricity.