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It's the physical property that indicates the degree/intensity of heat present in a substance or an object. It can be expressed and measured according to various scales.
6
votes
How can we explain the linear relation between the temperature scales?
In order to define a scale of temperature we need to follow three steps:
To choose a thermometric property which changes with temperature;
To define two reference points;
To define an interpolation. … Hence if we plot temperature in Fahrenheit versus volume we obtain a straight line (dotted line), i.e.,
As we can see, the dotted line, which is a straight line also provides a function between the …
2
votes
Fully understanding the effects of specific heat
In fact your perception of hotness is not due to temperature but rather due to heat transfer rate from the medium to your body's sensory receptors. … An objective definition of hotness would be given by the temperature of the body and since sand and water (in thermal equilibrium) are at the same temperature, we cannot say one is hotter than the other …
1
vote
How is it possible that particles maintain continual motion?
The kinetic theory also states that the collisions of the particles with walls are elastic, therefore there is no kinetic energy lost. Regarding the first law, it only says how energy can be exchanged …
1
vote
How can I understand the two things coming from the thermodynamic second law?
temperature $T_h$ is
determined by $$T_1=\frac{T_2}{1-\eta_R}. … \tag{2}$$ This is an absolute
temperature since it can be checked by any reversible engine with no
ambiguities. Note that this not define temperature, since this is done only by the zeroth law. …
8
votes
What is the difference between thermodynamic and empirical temperature?
The definition of an empirical temperature is basically what the Zeroth Law of Thermodynamics does.
Let us suppose we do not have any prior knowledge about temperature. … Each class is labeled by a number $T>0$ which we shall call temperature. The Zeroth Law allows us establish thermal equilibrium just in terms of temperature. …
1
vote
Is the relation between expansion of a liquid with temperature linear?
It is not true in general that liquids expand linearly with the temperature but it might be true for a particular liquid and a particular temperature scale.
Let us say you have mercury. … If you choose a linear interpolation, then, by definition, the volume of Mercury will be a linear function of the temperature $\mathrm{X}$. …
3
votes
What is a "Standard value"?
The "standard value" in this case refers to the concept of empirical temperature. The link explains with more detail the difference between empirical and thermodynamic temperatures. … In order to define an empirical temperature you need:
A substance with a thermometric property (such as mercury and its volume expansion). …
2
votes
0
answers
259
views
Does negative absolute temperature imply heat engine efficiency greater than one?
temperature, where the hotter body is the one which the heat flows from. … On the other hand, the efficiency of a reversible engine is
$$\eta=1-\frac{T_H}{T_C},$$
where $T_H$ and $T_C$ are the absolute temperature of the hot and cold sources, respectively. …
8
votes
How heat flow through finite temperature drop is an irreversible process?
A heat flow through a finite difference of temperature is irreversible because it does not satisfy the definition of reversibility. … To illustrate, let us consider a system at temperature $T$ in thermal equilibrium - that is at the same temperature - with a thermal reservoir. …
14
votes
What is the definition of temperature, once and for all?
From a logical and thermodyamic point of view, the definition of temperature must be given by the Zeroth Law of Thermodynamics.
Let us say we do not know what temperature is. … _1$ is determined by
$$T_1=\frac{T_2}{1-\eta_R}.$$
Note that there is no longer arbitrariness about the concept of temperature, except for the choice the the temperature of the cold source. …
3
votes
Accepted
Definitions in thermodynamics: temperature, thermal equilibrium, heat
Now we are able to define temperature. From a purely thermodynamic point of view this is done through the Zeroth Law. A detailed explanation can be found in this post. … Basically,
We say that two bodies have the same temperature if and only if they
are in thermal equilibrium. …
63
votes
What makes cheese so effective at absorbing microwaves?
This means that given the same amount of heat, the temperature change is higher for fat than for water. You can see in this table as normally fatty food has greater specific heat. … Moreover, oils have higher boiling points so the cheese can reach a temperature above $100\ \mathrm{^\circ C}$.
Edit
Both vegetable and animal oils are made of nonpolar molecules. …
0
votes
Will a hole cut into a metal disk expand or shrink when the disc is heated?
I would like to add a microscopic perspective to this question that were mentioned in comments but which I think deserves more attention. A macroscopic body expands when heated because the average sep …
10
votes
Accepted
Which temperature does $T$ in Clausius inequality ($\oint \frac{\delta Q}T\le 0$) refer to?
The temperature appearing the the Clausius inequality is definitely the temperature of the "boundary interface (with the surroundings)", or simply the temperature of the sources. … It is worth to mention that the temperature in the expression for the entropy is then the temperature of the system. …
2
votes
Entropy and intuition about it's units
Now recall that temperature is actually a measure of molecular (or particle) agitation. Greater the temperature, grater the agitation. … The unit of entropy is unit of heat by unit of temperature. …