William Thompson, Lord Kelvin,
Popular Lectures and Addresses, 1891-1894,
In Emily Morison Beck ed., Boston, U.S.A., Little, Brown and Company, 1968.
William Thompson, Lord Kelvin,
Popular Lectures and Addresses, 1891-1894,
In Emily Morison Beck ed., Boston, U.S.A., Little, Brown and Company, 1968.When you can measure what you are speaking about, and express it in numbers, you know something about it; but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meager and unsatisfactory kind: it may be the beginning of knowledge, but you have scarcely, in your thoughts, advanced to the stage of science.