Any instrument for measuring the intensity of light or comparing the intensity of two lights.
The art of measuring the intensity of light.
The first layer of the OSI reference model. It governs hardware connections and byte-stream encoding for transmission.
A specialist in the science that treats of the phenomena associated with matter and energy.
The science that treats of the phenomena associated with matter and energy.
The doctrine that land and its products are the only true wealth.
The external appearance merely.
Description of nature.
The science of organic functions.
The physical structure or organization of a perso