Specific Heat Capacity of water

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Discussion Overview

The discussion revolves around the specific heat capacity of water and how it may be affected by the presence of sediments and particulates, such as iron oxide. Participants explore theoretical implications and practical considerations regarding mixtures of pure water and water containing these particulates.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant states that the specific heat capacity of water is approximately 4.18 J/gK and questions how the presence of particulates like iron oxide would affect this value.
  • Another participant suggests that the heat capacity of iron oxide is much lower than that of water, implying that mixtures would have a lower heat capacity than pure water.
  • A different viewpoint is presented, proposing that dirty water may be a less efficient heat transfer medium, potentially leading to a higher specific heat capacity.
  • A participant analyzes a hypothetical scenario comparing pure water and dirty water, concluding that the specific heat of the dirty water might be lower due to the lower specific heat of the particulates.
  • Concerns are raised about the role of suspended particulates in heat transfer through conduction, questioning whether they interfere with heat transfer efficiency.
  • Another participant mentions that specific heat capacity measurements of water likely involve stirring to mitigate conduction errors, suggesting that thermal conductivity ensures uniform temperature but does not change the energy required to raise the temperature.

Areas of Agreement / Disagreement

Participants express differing views on whether the specific heat capacity of a mixture would be higher or lower than that of pure water, indicating that multiple competing perspectives remain unresolved.

Contextual Notes

Participants discuss assumptions regarding the effects of particulates on heat transfer and the conditions under which specific heat capacity is measured, but these assumptions are not fully resolved.

Who May Find This Useful

This discussion may be of interest to those studying thermodynamics, material science, or environmental science, particularly in contexts involving water quality and heat transfer properties.

Ajaxx757
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The specific heat capacity of water is accepted to be roughly 4.18 J/gK. How would the specific heat value of a given water sample be effected when sediments and other forms of particulation, such as iron oxide from rust, are present? Would the mixture have a higher specific heat capacity value compared to pure water and thus require more energy to satisfy the same delta T?

Thoughts and any insight will be much appreciated.
 
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Well, what would you think would happen?
 
The heat capacity of iron oxide is much lower than water. So, the heat capacity of the mixtures of water and iron oxide would be less than water alone.

chet
 
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SteamKing said:
Well, what would you think would happen?

I would expect the dirty water to be a less efficient heat transfer medium and therefore have a higher specific heat. But, let's say I had 10g of pure water as sample A and 10g of dirty water (a mixture of sediments and iron oxides) as sample B, of that 10g the particulates account for .5g of the total weight. Sample A would have a SH of roughly 4.18 while sample B would have a SH value of 4.18 for 9.5g of the mixture and a value "c" for the .5g of particulates with c being less than the value of water. When I look at the situation this way I believe the dirty water would have a lower SH. However, I also wonder on a molecular level if the particulates which are in suspension, play a role in how heat is transferred through conduction. Meaning do they, the particulates, interfere with how well heat is transferred to the surrounding water.
 
Chestermiller said:
The heat capacity of iron oxide is much lower than water. So, the heat capacity of the mixtures of water and iron oxide would be less than water alone.

chet
Chet, see my second post above. Do you believe my thought process is correct? I guess I'm asking, is you're statement based of a similar thought process of mine? And what would you have to say about my last portion with the particulates being in suspension and perhaps effecting how well heat is transferred to the mixture through conduction?
 
The specific heat capacity of water will probably have been measured using a rig that stirs the water to eliminate any error due to conduction. In any case good thermal conductivity just helps ensure uniform temperature. It doesn't/wouldn't change the energy required to raise the temperature.
 

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