What is Weber-Fechner law?

October 27, 2025

10/27/25

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Nyquist Team

This is a law formulated by Ernst Heinrich Weber. It is used to express the relationship between the physical measure of a stimulus and the sensory response (e.g., vision or hearing). It is also known as the strength of sensation. This law arises from many practical observations and has numerous technical applications.

It originally stated: “If stimuli sizes are compared, it is not the arithmetic difference between them that affects our perception, but the ratio of the compared sizes.”, and 30 years after it was expressed, it was mathematically described by its creator with the formula:

where:

  • dw – differential change in strength (intensity) of sensation,

  • k – differential change in the size of the stimulus

  • dB – experimentally determined proportionality coefficient.

This notation of the law means that the change in the reaction of a biological system is proportional to the relative change of the stimulus.

Nyquist Team

The Nyquist team is a group of enthusiasts in acoustics, design, and technology who combine engineering knowledge with aesthetic sensitivity every day. We create solutions that improve acoustic comfort and give spaces a unique character. On the blog, we share our experiences, knowledge, and inspirations drawn from our daily work on projects carried out across Poland and abroad. We believe that good acoustics is not just a technique – it’s a way of creating spaces where one simply enjoys being.

Nyquist Team

The Nyquist team is a group of enthusiasts in acoustics, design, and technology who combine engineering knowledge with aesthetic sensitivity every day. We create solutions that improve acoustic comfort and give spaces a unique character. On the blog, we share our experiences, knowledge, and inspirations drawn from our daily work on projects carried out across Poland and abroad. We believe that good acoustics is not just a technique – it’s a way of creating spaces where one simply enjoys being.

Nyquist Team

The Nyquist team is a group of enthusiasts in acoustics, design, and technology who combine engineering knowledge with aesthetic sensitivity every day. We create solutions that improve acoustic comfort and give spaces a unique character. On the blog, we share our experiences, knowledge, and inspirations drawn from our daily work on projects carried out across Poland and abroad. We believe that good acoustics is not just a technique – it’s a way of creating spaces where one simply enjoys being.

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