# Specific heat capacity of water

1. Nov 20, 2015

### rthrbe

I had an experiment to find the specific heat capacity of water. Materials are electric kettle, logger pro, 1 kg water, and set up the time to 240 seconds.

The experiment value i got is 4.33 kJ/(kg.K) which is closed to the waters specific heat capacity 4,18 kJ/(kg.K).

I wonder what could be the other factors that affect my experiment.

Last edited by a moderator: Nov 20, 2015
2. Nov 20, 2015

### Staff: Mentor

Welcome to the PF.

In the future, please fill out the Homework Help Template that you are provided when starting a schoolwork/homework thread here. It makes it much easier to give you help.

What do *you* think might be other factors and sources of error in your experiment?

3. Nov 20, 2015

### Mister T

4.18 kJ/(kg⋅K) means it takes 4.18 kJ of heat energy to change the temperature of one kilogram of water by one kelvin. Can you think of any reason why it took you more than 4.18 kJ to do the same thing to each kilogram of water in your kettle?

4. Nov 20, 2015

### rthrbe

Yeah i mean i could have some errors in my experiment, like the heat energy transferred (not sure w the term) not only to the water but also to the kettle. the electric kettle is made of plastic... is there any factors or errors?

5. Nov 20, 2015

### Mister T

Do you means errors or factors that could account for difference between the value you measured and the value measured by the experts?

Well, since the values are different, then obviously the answer is yes, there are.

What do you think those factors or errors could be? Does the fact that your value is higher than theirs tell you anything?

Maybe if you show us the calculation you did we might be able to help you.

6. Nov 20, 2015

### rthrbe

the specific heat capacity of water is 4, 18 kJ, that is the theoretical value, but on our experiment we got 4, 33 kJ, it is pretty close, and apparently there should be some kind of errors like loss of energy, something like that. i am not sure thats why i am asking for help

7. Nov 20, 2015

### Mister T

Since your value differs from theirs, you know you have some error. You say you're "not sure" but you are sure.

So, please see if you can respond in some other way.

In other words there are two possible questions here:

1. Does the fact that the two values are different mean there's some error?
2. What could be the sources of error?

The answer to the first question is yes. The answers to the second question lie in the details of how you calculated your value. That is why I asked you the questions I asked you in my previous replies. I can't answer you unless you answer me.

8. Nov 20, 2015

### rthrbe

i mean what could be the factors that affect my experiment, i mean why did i get 4, 33 instead of 4,18 there should be an explanation to that...

9. Nov 20, 2015

### rthrbe

10. Nov 20, 2015

### Mister T

What calculation resulted in 4.33? Can you show us? Can you explain what you did?

11. Nov 20, 2015

### Staff: Mentor

You need to start showing some effort in this thread, or it will be closed. We do not do your schoolwork for you -- that would be cheating.

We keep asking for you to put in some effort here. What do YOU think those sources of error could be?

12. Nov 21, 2015

### rthrbe

I used the logger pro, and the gradient was 0.3808. I've used the formula E= cm delta T ofcourse,

13. Nov 21, 2015

### rthrbe

Can you please read the threads too, i have already shown my solution but I haven't figure out yet what really might be the other cause why my value is little bit higher.

14. Nov 21, 2015

### Mister T

You have not shown your solution, only the result of your solution. Telling us that you used the "gradient" on LoggerPro tells me that you made a graph in LoggerPro and used the slope. LoggerPro is software that lets you graph sensor readings. But what sensor readings did you graph? Temperature? Once you found the slope what did you do with that number to get your result?

15. Nov 21, 2015

### rthrbe

it is the time vs temperature graph

16. Nov 21, 2015

### Mister T

My patience has come to an end. If, the next time I read this thread I don't see at least an attempt to answer every question I've asked, I'll not respond. Otherwise all I can do is repeat my questions. Something I've already done ad nauseam.

17. Nov 21, 2015

### Staff: Mentor

Thread is closed due to the OP continuing to refuse to show some effort on her question.