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116问答网 > 准稳态法测比热和导热系数实验中如何判断系统进入准稳态

准稳态法测比热和导热系数实验中如何判断系统进入准稳态

2025-03-16 05:58:03

推荐回答（2个）

回答1：

中心面和加热面的温差达到某个数值并在一段时间内变化很小（具体要求看实验精度要求），再加热一段时间后可能会脱离准稳态，温差减小。
反映在数据上即U2（t2t1）在进入准稳态后变化很小
可用数据图表来判断，即曲线平稳进入准稳态

回答2：

1.器材本身的仪器误差 2.读数时产生的人为误差 3.外界环境变化造成的误差 4.没有预热就直接做实验 5.没有等|Vt|<=0.010mV就直接加热

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