Surface Tension

intermediate2 min readpolitics · history · sociology · physics · psychology

A mental model that applies fluid dynamics concepts of viscosity and surface tension to information flow in social and political systems. High viscosity for true information and low viscosity for false information can lead to catastrophic failures, as seen in the Chernobyl disaster.

THE IDEA

Viscosity describes resistance to flow within a fluid; surface tension concerns its interface with another medium. Applied by analogy to information, viscosity represents obstacles that slow a message’s movement, while surface tension represents barriers between groups. Those obstacles may affect accurate and inaccurate messages differently. The question is which messages a system allows to move, and which it blocks.

Agnes Pockels: Overcoming a Viscous Environment

Agnes Pockels wanted to study physics at the end of the 19th century in Germany, but women were barred from universities. Her younger brother shared his textbooks and advances in physics. At home caring for aging parents, she pursued her passion, developing the Pockels trough—a simple tool to measure water surface tension under different concentrations of oils and soaps. She published several papers and contributed to surface tension research without formal university training. The account uses her experience to illustrate the high “viscosity” of an environment that restricted women’s access to science.

The Chernobyl Disaster: High Viscosity for Truth

The Cold War Soviet Union amplified forces that impeded the free flow of information. This viscous information environment helped the state maintain control but directly contributed to the Chernobyl disaster. In Chernobyl: The History of a Nuclear Catastrophe, Serhii Plokhy details how:

Previous nuclear accidents (e.g., in Leningrad) were classified, preventing lessons learned.
After the 1986 explosion, phone networks were cut, plant workers silenced, and the public given no warnings.
The leadership prioritized image and secrecy, even organizing a massive May Day parade in Kiev, exposing thousands to radiation.
Bureaucratic fear created a feedback loop: subordinates bullied into submission, unrealistic quotas demanded, and negative information buried. True information faced high viscosity, while fabricated reports flowed easily.
The system’s neglect for immediate well-being, combined with secrecy, meant Prypiat residents were told they would return home in three days; hospitals lacked equipment for radiation poisoning.

This structural suppression of truth ultimately backfired. It fueled public outrage and distrust, accelerating Ukrainian independence efforts—undermining the very control the Soviets sought.

When to use it

Diagnosing communication breakdowns in bureaucracies or corporations
Designing crisis communication protocols to lower barriers to accurate information
Evaluating censorship policies and their unintended consequences
Strengthening team knowledge-sharing by identifying and removing 'viscous' obstacles

FROM THEORY TO EVERYDAY LIFE

In practice

Agnes Pockels and the Pockels Trough

Despite institutional barriers, Agnes Pockels designed an instrument to measure surface tension and contributed to research in the field. Her experience illustrates the account’s analogy between a viscous medium and a society that restricted women’s access to science.

Chernobyl Nuclear Disaster: The Cost of High Information Viscosity

The Soviet system created an environment where true information could not flow to those who needed it, while false reports moved freely. This led to unpreparedness, inability to learn from past accidents, delayed evacuations, widespread radiation exposure, and eventual erosion of trust in the regime.

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A MOMENT TO REFLECT

Put it to work.

Where in your organization does true information face high viscosity? What consequences does this create?
How can you reduce the surface tension between departments or groups to improve information sharing?
When have you observed false information flowing more easily than truth, and what structural factors enabled that?