Temperature Measurement: Are All Thermometers Created Equal?

[barzani]

What is the difference in temperature with different thermometers for the same object?

Thanks !

 

[BvU]

Hllo Barzani,

Ideally they should all agree and measure the same temperature ...

Is that really what you mean to ask ?

 

[barzani]

Thanks

Suppose we have a one thing we want to find the temperature

Testing with thermocouple: 20 C

We will test with the thermomister : 24 C

With and ...

What is the cause of these differences?

 

[BvU]

I can't tell from here. One of the two -- or both -- may be wrong, badly calibrated, ... Or the object under scrutiny is warming up in the time between measurements, or ...

Thing to do is calibrate the two measurement devices: measure in water with ice to find 0 $^\circ$C and in boiling water to find .. at least the same value (which may not be exactly 100 $^\circ$C)

 

[davenn]

What is the cause of these differences?

One of the two -- or both -- may be wrong, badly calibrated

I agree with BvU ... calibration would be the obvious reason for differences

 

[barzani]

This is 2 reasons
The 1-body may change the temperature at intervals between them

2. No calibrating machine

Is there any other reason?

Why can not I find something on the Internet

 

[barzani]

I agree with BvU ... calibration would be the obvious reason for differences

good
?
but we have more another cause ?

 

[RPinPA]

We need more details on how you're doing these measurements. They may not be making the same measurement under identical conditions. Are these in contact with the surface of your object? How do you ensure that it achieves good thermal contact with the object and is not influenced by the ambient environment?

 

[BvU]

This is 2 reasons
The 1-body may change the temperature at intervals between them
2. No calibrating machine
Is there any other reason?
Why can not I find something on the Internet

Things can go wrong for so many reasons that even the internet can't come up with all of them

By the way, this thread smells like a lab assignment and belonging in the homework forum...

 

[davenn]

The 1-body may change the temperature at intervals between them

yes, and that would have to be taken into account ... so therefore use both measurement systems at the same time to negate that problem

2. No calibrating machine

the thermometers SHOULD have been calibrated as part of the manufacturing process
For good quality ones, that shouldn't be an issue
For el cheapo ones, who knows what they use to calibrate the sensors. "You pay your money and you take your chances"Dave

 

[barzani]

Things can go wrong for so many reasons that even the internet can't come up with all of them

By the way, this thread smells like a lab assignment and belonging in the homework forum...

it is goodwe can also tell

The temperature-sensitive material is not directly in contact with air and is heated by thermal conductivity. This is a self-limiting factor؟؟؟؟؟؟؟؟/

 

[barzani]

yes, and that would have to be taken into account ... so therefore use both measurement systems at the same time to negate that problem

the thermometers SHOULD have been calibrated as part of the manufacturing process
For good quality ones, that shouldn't be an issue
For el cheapo ones, who knows what they use to calibrate the sensors. "You pay your money and you take your chances"Dave

good thanks

see above my reply and tell me it is correct?

 

[barzani]

We need more details on how you're doing these measurements. They may not be making the same measurement under identical conditions. Are these in contact with the surface of your object? How do you ensure that it achieves good thermal contact with the object and is not influenced by the ambient environment?

This is just an urgent question asked at the university asking and answering

Consider all the conditions for each device

 

[ZapperZ]

This is just an urgent question asked at the university asking and answering

Consider all the conditions for each device

So we have been doing your assignment for you?

Zz.

 

[berkeman]

So we have been doing your assignment for you?

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