ocean trenches and within the ocean mixed layer.

When the potential temperature is used instead of the measured ambient temperature, the apparently unstable conditions vanish, since a parcel of fluid is invariant along its iso-layers.

In the oceans, the potential temperature referenced to the surface will be slightly less than the in-situ temperature (the temperature of a water volume measured by an instrument in the water at depth) since expansion due to reduction in pressure of a sample brought

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