When you cannot measure, your knowledge is meager and unsatisfactory.

- Lord Kelvin

Radio has no future." "X-rays are clearly a hoax". "The aeroplane is scientifically impossible.

- Lord Kelvin

I often say that when you can measure what you are speaking about, and express it in numbers, you know something about it; but when you cannot measur…

- Lord Kelvin

In science there is only physics; all the rest is stamp collecting.

- Lord Kelvin

If you study science deep enough and long enough, it will force you to believe in God.

- Lord Kelvin

Heavier-than-air flying machines are impossible.

- Lord Kelvin

When you can measure what you are speaking about, and express it in numbers, you know something about it.

- Lord Kelvin

When you are face to face with a difficulty, you are up against a discovery.

- Lord Kelvin

There is nothing new to be discovered in physics now. All that remains is more and more precise measurement.

- Lord Kelvin