This Test Guideline lists methods for determining the density of liquids and solids, giving only a very succinct description of them. The density of a substance is the quotient of its mass and its volume and is expressed in kg/m3. Several methods are for liquid substance only: hydrometer,...

On the surface there is agreement, sustainable development refers to a broad set of issues, going beyond the relationship between the economy and the environment to encompass human and social concerns. Scratch the surface and you open a Pandora's box of differing notions of sustainability and...