The postulate of the kinetic molecular theory that breaks down under conditions of low temperaturesthere is - "no attraction or repulsive forces between the gas particle"
The kinetic molecular theory's "there is no attraction or repulsive forces between the gas particle" premise is one of the postulates that fails at low temperatures.
At low temperatures, this hypothesis does not hold up well. Because gas particles move more slowly at low temperatures than they do at high temperatures. Due of the particles' slow mobility, they might be drawn to nearby particles by their slow motion. At low temperatures, these particles will be more likely to interact with the adjacent particles. Therefore, at low temperatures, there is an interaction force between particles.
Hence, "no attraction or repulsive forces between the gas particle" is the postulate which fails under low temperature.
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