*A Brief History of Time*).

Werner Heisenberg proposed the uncertainty principle when he found it was impossible to accurately measure the position and velocity of a particle without that examination affecting the particle’s position or velocity. To see the position of a particle, you must shine a quantum of light on it, and the more accurately you want to measure it, the shorter the wavelength of the light needs to be. The shorter the wavelength, the higher the energy of the quantum, and as such the more it will knock the particle off its original course. This principle is central to modern understanding of the small-scale structures of the universe.

## Uncertainty principle Quotes in *A Brief History of Time*

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*A Brief History of Time*quotes below are all either spoken by Uncertainty principle or refer to Uncertainty principle. For each quote, you can also see the other terms and themes related to it (each theme is indicated by its own dot and icon, like this one: ). Note: all page numbers and citation info for the quotes below refer to the Bantam edition of*A Brief History of Time*published in 1988.**Chapter 4 Quotes**

The success of scientific theories […] led the French scientist the Marquis de Laplace […] to argue that the universe was completely deterministic. Laplace suggested that there should be a set of scientific laws that would allow us to predict everything that would happen in the universe.

**Related Characters:**Werner Heisenberg, Marquis de Laplace

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*A Brief History of Time*LitChart as a printable PDF.## Uncertainty principle Term Timeline in *A Brief History of Time*

The timeline below shows where the term Uncertainty principle appears in

*A Brief History of Time*. The colored dots and icons indicate which themes are associated with that appearance.Chapter 4

**uncertainty**principle. To measure a particle’s position and velocity, one must shine light on it to...

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**uncertainty**principle. This theory does not predict definite outcomes, but potential outcomes. It works on the...

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**uncertainty**principle made particles seem more like waves, with their movement spread out according to probability....

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Chapter 7

**uncertainty**principle. When Hawking later did the mathematics to investigate it, he found even non rotating...

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**uncertainty**. Pairs of particles and virtual particles will appear and collide, annihilating each other. One will...

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Chapter 8

**uncertainty**principle, but how did he decide these laws? We could say we cannot possibly hope...

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**uncertainty**principle tells us there was a minimum level of fluctuations, and the no boundary theory...

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Chapter 9

**uncertainty**principle allows. After a period of inflationary expansion, regions would slow their expansion and begin...

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Chapter 11

**uncertainty**principle, on which quantum theory is based, is fundamental, and must be incorporated into any...

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**uncertainty**principle that defines quantum mechanics.

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**uncertainty**principle and general relativity. This has already resulted in significant rethinks, such as black holes...

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**uncertainty**principle and general relativity one can either adjust the strength of gravity or the cosmological...

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**uncertainty**principle, we have removed the third option. Activity is random to a certain degree, but...

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**uncertainty**principle and the fact the math is simply too hard. While scientists know in essence...

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Chapter 12

**uncertainty**principle of quantum mechanics, which introduces a minimum level of randomness. Quantum theory gives particles...

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