中3物理有唔明 急求救 20分

2008-06-11 9:22 am
小弟分極都唔明白熱容量同比熱容量兩條式既含意
姐係

C=E/(三角形)T 或者 E=C(三角形)T



c=E/m(三角形)T 或者 E=mc(三角形)T

希望大家可以比d方法我易d去理解
因為過幾日就考phy
所以想各位物理高手幫幫忙

回答 (2)

2008-06-13 9:47 am
熱容量 is sth does not include the mass in calculation
which means 熱容量 changes from different case even same substance is measuring

e.g.
a glass of water, 4.2 kJ of energy is needed to heat up from 20oC to 25oC
4200 / (25-20) = 840 J/oC
e.g.
a swimming pool, 5.25 x 10^7 kJ of energy is needed to heat up from 20oC to 25oC
5.25 x 10^10 / (25-20) = 1.05 x 10^10 J/oC

比熱容量 is sth include the mass in calculation
which means 比熱容量 is the same in different case for the same substance is measuring

e.g.
the 比熱容量 of water is always 4200 J/kgoc
參考: F.5 knowledge
2008-06-13 2:41 am
熱容量公式:C=E/ΔT,其中C係熱容量,E係能量,ΔT係上升溫度。

條式既意思係話,某一物體既溫度上升ΔT,需要E咁多能量,該物體既熱容量C就等於E除以ΔT。


比熱容公式:c=E/mΔT,其中C係熱容量,E係能量,m係質量,ΔT係上升溫度。

條式既意思係話,某一物體質量為m,溫度上升ΔT,需要E咁多能量,該物體既比熱容c就等於E除以mΔT。


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