The Pharmaceutical era . 594 TUE PHARMACEUTICAL ERA. [October 21, 1897. HkUUt than (lie surrouiidiug i>ortious, by whicli iiieauHit 18 c-iiiiseil lo risf aud impart iis warintli to tla- airuud other objects of the room. Conveclioii currents maybe made visible by placiug some insoluble powder, asbrau, in a vessel of cold water which is then exposed loa source of heat. The motion of the solid particles willshow the rise of heated currents in Ihe center whichHow off at the top to the sides and down again until allof the water is raised to the same temperature. (Fig. 52.)It is mainly by convect
The Pharmaceutical era . 594 TUE PHARMACEUTICAL ERA. [October 21, 1897. HkUUt than (lie surrouiidiug i>ortious, by whicli iiieauHit 18 c-iiiiseil lo risf aud impart iis warintli to tla- airuud other objects of the room. Conveclioii currents maybe made visible by placiug some insoluble powder, asbrau, in a vessel of cold water which is then exposed loa source of heat. The motion of the solid particles willshow the rise of heated currents in Ihe center whichHow off at the top to the sides and down again until allof the water is raised to the same temperature. (Fig. 52.)It is mainly by convection that heat is disseminatedthrough liiiuids and gases. Radiation is the transmission of heat by vibration with-out raising the temi>erature of the space through whichit travels, as in the passage of the suns heat to theearth. Heat in radiation does not exist as heat proper,but as a motion of the ether, and is reconverted into heat only when its free passage through space is checkedby coining in contact with some mat
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Keywords: ., bookcentury1800, booksubjectdrugs, booksubjectpharmacy, bookyear1
