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Article THE CHEMISTRY OF COMMON THINGS. Page 1 of 5 →
Note: This text has been automatically extracted via Optical Character Recognition (OCR) software.
The Chemistry Of Common Things.
T ^
( Continued from page 1116 .. ) The accumulation of heat produced by obstructing the egress of heat from the body by covering it with non-conducting substances is dependent entirely upon tlieir non-conducting power . Thus clothing of cloth or flannel and woollen materials generally is more effective in keeping up the heart of the body in cold weather ., than are lighter materials ; but in warm weather , when the heat of the body will not
BY FEANGIS : HEHEY BAKEE . II . —HEAT .
escape so readil y ^ the latter ar ^ the temperature of the body often becomes so great as to occasion , discomfort , although the air is many degrees cooler than the body in its natural state : and this feeling extends even to the face , the heat
of which is not retained , by any part of the clothing ; this being occasioned by the portions of the air ( which is a non-conductor ) in its immediate contiguity becoming heated , and clinging to the face , forming a covering which retards the further propagation of the heat . In such cases , the common remedy is the use of a fan , which by agitating the air constantly brings fresh portions into contact with the face , and as the air , even on a hot summer ' s dav , is considerably
cooler than the body , this prevents the undue accumulation of heat . Thermometer . Since then the sense of feeling is such an uncertain test of the presence and quantity of heat , various means have been devised for ascertaining the real temperature of bodies . The most obvious method for measuring sensible heat is Jpy observing its effect
in dilatation . A s the size of all bodies , whether solid or liquid , increases with their temperature , their relative temperature , under certain conditions , may be known by noting their dimensions as compared with those which they take at a standard temperature . The substance which can be most advantageously used for measuring temperature is mercury , and for several reasons , it is in the liquid state at ordinary temperatures , and continues so through a very wide range of temperature . The enlargements of volume corresponding to
successive increments of heat , follow with the most remarkable regularity 3 it is a metal , and a good conductor , and so readily assumes the temperature of surrounding objects ; its specific heat is Yevy small , so that it is affected by small ( piantities of sensible heat ; and it is opaque , and easily seen , even when in a finely divided state . This liquid , included in . a line glass tube , with a bulb at one end , and hermetically sealed at the other , and affixed to a divided stand , constitutes the ooimnou . theriuometor . The divisions on the stand are
Note: This text has been automatically extracted via Optical Character Recognition (OCR) software.
The Chemistry Of Common Things.
T ^
( Continued from page 1116 .. ) The accumulation of heat produced by obstructing the egress of heat from the body by covering it with non-conducting substances is dependent entirely upon tlieir non-conducting power . Thus clothing of cloth or flannel and woollen materials generally is more effective in keeping up the heart of the body in cold weather ., than are lighter materials ; but in warm weather , when the heat of the body will not
BY FEANGIS : HEHEY BAKEE . II . —HEAT .
escape so readil y ^ the latter ar ^ the temperature of the body often becomes so great as to occasion , discomfort , although the air is many degrees cooler than the body in its natural state : and this feeling extends even to the face , the heat
of which is not retained , by any part of the clothing ; this being occasioned by the portions of the air ( which is a non-conductor ) in its immediate contiguity becoming heated , and clinging to the face , forming a covering which retards the further propagation of the heat . In such cases , the common remedy is the use of a fan , which by agitating the air constantly brings fresh portions into contact with the face , and as the air , even on a hot summer ' s dav , is considerably
cooler than the body , this prevents the undue accumulation of heat . Thermometer . Since then the sense of feeling is such an uncertain test of the presence and quantity of heat , various means have been devised for ascertaining the real temperature of bodies . The most obvious method for measuring sensible heat is Jpy observing its effect
in dilatation . A s the size of all bodies , whether solid or liquid , increases with their temperature , their relative temperature , under certain conditions , may be known by noting their dimensions as compared with those which they take at a standard temperature . The substance which can be most advantageously used for measuring temperature is mercury , and for several reasons , it is in the liquid state at ordinary temperatures , and continues so through a very wide range of temperature . The enlargements of volume corresponding to
successive increments of heat , follow with the most remarkable regularity 3 it is a metal , and a good conductor , and so readily assumes the temperature of surrounding objects ; its specific heat is Yevy small , so that it is affected by small ( piantities of sensible heat ; and it is opaque , and easily seen , even when in a finely divided state . This liquid , included in . a line glass tube , with a bulb at one end , and hermetically sealed at the other , and affixed to a divided stand , constitutes the ooimnou . theriuometor . The divisions on the stand are