This article is rated List-class on Wikipedia's
content assessment scale. It is of interest to the following WikiProjects: | |||||||||||
|
Seems like a strange colour to choose. I dont know if i am alone in this, but for me it blended in with the black quite easily. Maybe a bolding, highlight, or other colour would be better. I don't know wikipedia's specific rules on this type of stuff.
Epmtunes ( talk) 19:19, 12 May 2020 (UTC)
dubious – discuss It seems that the value Cp for Iron is not correct. Multiplying molar mass and molar heat capacity of iron produces different value (0.450) and this value also appears in other sources though I am not able to find a primary source of either of these values. This seems like a good source for the molar heat calacity of iron https://webbook.nist.gov/cgi/cbook.cgi?ID=C7439896&Mask=2&Type=JANAFS&Table=on#JANAFS Ideally the whole table should be verified if this value is not correct and they were taken from the same source...
The page you refer to shows the actual problem, if one plots the actual graph of the specific heat capacity of iron as a function of temperature. The specific heat capacity of iron is far from constant against changing temperature ranges. So, you can only report it for a specific temperature range. Typically tables like ours here lack this detail and the value is given like it is universal. Well, for many elements and materials it is far from it. So, to be taken seriously, any table like the one here should have a temperature range where each specific heat capacity value can be expected to hold. -- Jvp2010 ( talk) 09:26, 21 September 2023 (UTC)
Substance Phase Isobaric mass
Water (Steam) - fifth Column: 28.03 = (8,314 * 3.37) = 3.37R (Not 1.12R in last column) Water Liq. 100°C / 0°C - fifth Column: 74.53 = (8,314 * 8.96) = 8.96R (Not 1.12R in last column) Water ice 0°C - value in fifth column should be similiar to value in fourth column (minimal work via expansion) - fourth Column: 38.03 = (8,314 * 4.57) = 4.57R (Not 1.53R in last column) Someone should check my thought and then update the table. — Preceding unsigned comment added by 2003:E4:9702:E501:2DF1:F4DF:55F2:4D99 ( talk) 07:53, 17 April 2022 (UTC)
In general, the last (seventh) column seems to be wrong for most liquids. Molecular liquids should have heat capacities around 9 R and roughly equal to CP (since liquids are mostly incompressible). Also, it‘s suspicious that this column is entirely filled while the fifth column is not. 2.244.188.201 ( talk) 22:37, 8 May 2023 (UTC)
I would just delete the row where the CP of water at 100 C is stated as 4.18 — Preceding unsigned comment added by 2600:1700:5D0:D490:F9DE:61FC:3261:11C6 ( talk) 13:19, 12 July 2023 (UTC)
The table should use SI-units, f.i. J/kg/K and not J/g/K. Furthermore, as already stated above, several values seem to be wrong.
I'd suggest fully removing the table. This is - in my opinion - much better than confusing readers with a table containing obviously faulty values. 217.111.88.123 ( talk) 15:52, 16 August 2023 (UTC)
The table lists some values for "Steel". However, there is no reference to source and no indication about the nature of steel in question. For example, [stainless steel] contains at least 10,5% of [chromium], while [carbon steel] contains only small amount of [carbon]. These additives make a big difference in the heat capacity values. And they vary A LOT (see for example [SAE_steel_grades]). So, any value should have at least a reference to source. Now there is none.
At the same time, it is difficult to find values for steel as the they vary so much. So some values for couple of different basic steels would be most useful. Of course, if one knows the exact composition of the steel in question, the heat capacity could be calculated as mass-average or molar average. But even that may not be correct or even close to correct.
As the provided value for specific heat capacity of steel is very close to the specific heat capacity of iron (that is also very problematic), it can be assumed the value in the table belongs to some low carbon steel, but without reference this is a guess. Jvp2010 ( talk) 09:07, 21 September 2023 (UTC)