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Pronunciation varies by accent · noun
Inability to transmit radiant heat; impermeability to heat; the quality of being a good insulator..
In fact the very experiments devised to show conductivity proved in a very striking manner the existence of athermancy, or opacity to radiant heat, in the case of a considerable number of gases.
Use athermancy when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Athermancy means Inability to transmit radiant heat; impermeability to heat; the quality of being a good insulator..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
In fact the very experiments devised to show conductivity proved in a very striking manner the existence of athermancy, or opacity to radiant heat, in the case of a considerable number of gases.
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