2. pertaining to or emanating from focus. focal distance. see focal-film distance. focal length. the distance between the lens and an object from which all rays of light are brought to a focus. focal liver disease. widely disseminated micro-abscesses or abscesses, migration paths of helminth larvae.. pertaining to or emanating from focus. focal distance. see focal-film distance. focal length. the distance between the lens and an object from which all rays of light are brought to a focus. focal liver disease. widely disseminated micro-abscesses or abscesses, migration paths of helminth larvae.
The kilogram or kilogramme (SI unit symbol: kg) is the base unit of mass in the International System of Units (SI) (the Metric system) and is defined as being equal to the mass of the International Prototype of the Kilogram (IPK, also known as Le Grand K or Big K).
The kilogram or kilogramme is the base unit of mass in the International System of Units, and is defined as being equal to the mass of the International Prototype of the Kilogram, a cylinder of platinum-iridium alloy stored by the International Bureau of Weights and Measures at Saint-Cloud, France. It is the only metric base unit which is defined by an artifact. The kilogram was originally defined as the mass of a litre of water at the freezing point. That was an inconvenient quantity to precise