At what temperature molecular motion ceases
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At absolute zero temperature (zero Kelvin)molecular motion ceases.
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All types of molecular motion ceases at 0 kelvin or -273.15 °C ( also known as absolute zero).
It is because the entropy( state of disorder of a system) and enthalpy( the amount of heat in a system) tend to approach towards zero at this temperature and thereby the molecules tend to become motionless.
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