1. It makes international projects easier to handle
2. It avoid errors when some part of a project may be in traditional US units.
microbes made beverage and food go bad
Chemical composition is always a property of an ore.
A 'red' apple does not emit red light. Rather, it simply absorbs all the frequencies of visible light shining on it EXCEPT for a group of frequencies that is perceived as red, which are REFLECTED. An apple looks red to us because it REFLECTS infrared waves.
