Concrete Canoe. The Greek polymath Archimedes is said to have solved the mystery of buoyancy in a bathtub. Even if the story is apocryphal, his principle isn't: If an object weighs less than the water it displaces, it won't sink. Even concrete can float. Materials scientist Joseph-Louis Lambot built a concrete dinghy featured in the 1855 World's Fair.
Definition of BIOFILTER. : a filter bed in which sewage is subjected to the action of microorganisms that assist in decomposing it. ADVERTISEMENT. 2bi- + filter.rigin of BIOFILTER. 2bi- + filter. This word doesn't usually appear in our free dictionary, but the definition from our premium Unabridged Dictionary is offered here on a limited basis.
Bioplastics and Biobased Adhesives. A new plastics industry buzzword has recently appeared, namely bioplastics. The term is often misunderstood or misapplied, which is understandable as its definition is somewhat flexible. Though only about 1% of plastics production worldwide is bioplastics, their use is growing. They hold the promise of lower environmental impact by encouraging renewable sources of plastic monomers. What Is a Bioplastic Exactly? Bioplastic refers to a family of materials, not a single substance. Essentially, a bioplastic is plastic material derived from plants. It may or may not be biodegradable. A less precise definition would be that it is plastic not derived from petroleum, which most plastics are.