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Is Hot Oil Thinner Than Water?

Published in Science 1 min read

No, hot oil is not thinner than water.

While it's true that heating liquids generally makes them less viscous (thinner), this effect is much more pronounced in oils compared to water.

Here's why:

  • Water molecules are smaller and more tightly packed than oil molecules. This makes water inherently more viscous than oil at room temperature.
  • Heating water breaks hydrogen bonds between molecules, decreasing viscosity. However, the effect is relatively small.
  • Heating oil weakens the Van der Waals forces between molecules, significantly decreasing viscosity. This is why hot oil flows much more readily than cold oil.

In summary: Even when heated, oil remains thicker than water due to its molecular structure and the stronger intermolecular forces present in water.

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