Conversations on chemistry : in which the elements of that science are familiarly explained and illustrated by experiments : to which are now added explanations of the text, questions for exercise, directions for simplifying the apparatus and a vocabulary of terms, together with a list of interesting experiments . >g FREE CALORIC. 47 atmosphere receives its heat, I no longer wonder that eleva-ted regions should be colder than plains and valleys. It wasalways a subject of astonishment to tne, that in ascending amountain and approaching the sun, the air became colder in-stead of being more he
Conversations on chemistry : in which the elements of that science are familiarly explained and illustrated by experiments : to which are now added explanations of the text, questions for exercise, directions for simplifying the apparatus and a vocabulary of terms, together with a list of interesting experiments . >g FREE CALORIC. 47 atmosphere receives its heat, I no longer wonder that eleva-ted regions should be colder than plains and valleys. It wasalways a subject of astonishment to tne, that in ascending amountain and approaching the sun, the air became colder in-stead of being more heated. Mrs. B. At the distance of about a hundred millions ofmiles, which we are from the sun, the approach of a fewthousand feet makes no sensible difference, whilst it producesa very considerable effect with regard to the warming of theatmosphere at the surface of the earth. Caroline. Yet as the warm air arises from the earth, andthe cold air descends to it, I should have supposed that heatwould have accumulated in the upper regions of the atmos-phere, and that we should have felt the air warmer as we as-cended ! Mrs. B. The atmosphere, you know, diminishes in densi-ty, and consequently in weight, as it is more distant from theearth : the warm air, therefore, rises only till it meets witha stratum of air
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