He didn't want to use negative numbers To measure temperature in Denmark outside.
他可不想用负数,来测量丹麦室外的温度。
That'll be inside our calorimeter. It's insulated, and there's still a thermometer, so we can measure the temperature.
被放置在量热计里面,它是绝热的,同样有一个温度计,让我们可以测量温度。
Another experiment would be to mix two chemicals together and put a thermometer in and measure the temperature.
比方说做这样一个试验,将两种化学试剂混合然后测定反应温度
You measure your temperature is a little up, you've got a fever, something's wrong, I better find out what that is' because temperature is a very highly controlled variable.
你测出体温偏高是,你就发烧了,身体哪里出问题了,我最好把问题找出来,因为体温是一个严格控制的身体指标
Now these quantities were useful because you could relate them. The slope of changes, with respect to volume or temperature of the energy with respect to quantities that you understood, that you could measure.
去得到这些量,这些量很有用,而且你们已经知道了,怎么把它们相互联系起来,像这种比例形式的量,能量比上温度或体,或其它你们懂的可以测量量。
Now let's change the pressure and temperature and sweep through a whole range of pressures and temperatures and measure the volume in every one of them.
然后改变气压和温度,并且让气压和温度,取便所有可能的数值,测量相应的体积。
I want to measure the temperature.
我想要测量温度。
It's tabulated in books, and this we can measure p in the experiment. Delta p here is the change in pressure from the left side to the right side, and we can put a thermometer, measure the temperature before the experiment and measure the temperature after the experiment.
这列在书上,这个量我们在,实验中也可以测量,在这里Δ,是从左边到右边的压强变化,我们可以放一个温度计,去测量实验前的温度,再去测量试验后的温度。
This is real, unlike the Joule coefficient which is very small so that most gases have tiny Joule coefficients. So if you do a Joule experiment, you hardly measure a temperature change. With real gases, here you do actually measure it. You can feel it with your finger on your bicycle tire.
系数那样小以至于,大多数气体的焦耳系数,都很小,所以如果你做焦耳实验,很难测量出温度的变化,对于真实气体,你可以测量它,你能通过手指按在,自行车轮胎上来感觉到它。
But because in many cases we can reasonably either model or measure equations of state, collect data for a material for its temperature, pressure, volume relations, then in fact if we can relate all these quantities to those then in fact we really can calculate essentially all of the thermodynamics. For the material.
但是因为在很多情况下,我们能够合理的给出状态方程的模型,或者通过收集一个物质的,温度,压强和体积之间的关系,来测量其状态方程,所以实际上我们可以给出压强等物理量,和热力学势之间的关系,并计算出所有的热力学势,对于给定的物质。
What we're really going to do in practice is we're going to measure, we're going to use our thermometer and say great, how much did the temperature change, right.
H1是零,实际上我们要做的,是用我们的温度计,测量温度改变了多少。
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