Does Mass Change With Temperature

TheShapeOfTime

Nosotros were told in chemistry form to weigh an evaporating dish afterwards it cooled. Does it'due south temperature affect it's mass?

Gokul43201

In general, the temperature does not impact the mass of a closed system.

In your class, you are probably allowing something to cool, and so that in that location is no more evaporation happening. That, or they don't desire you to burn your fingers touching a hot object. What's in the dish, anyway ?

TheShapeOfTime

There was [itex]CuSO_4 \cdot 5H_2O[/itex] in the evaporting dish. We were evaporating the water out of this hydrate to get an anhydrous compound. The goal was to find the ratio of h2o molecules to copper sulfate molecules. One of the questioins she asked us was why we should take the mass of the evaporating dish after it cools.

Gokul43201

I can but think this is a safety measure. Also, depending on what kind of remainder you are using, weighing something that'due south hot may give a faulty reading or might even impairment the residue. Practice you utilise a metal balace which uses moments or a digical balance which uses springs ? And I'll repeat :Temperature does not affect mass directly.

In your particular instance, information technology would be more accurate if you weigh the dish while however fiddling hot. When the copper sulfate cools, being slightly hygroscopic, it will start to re-absorb moisture from the atmosphere. If you wait too long for it to absurd, information technology may have re-absorbed a considerable corporeality of moisture that your calculation volition yield an underestimate.

pervect

We were told in chemistry form to weigh an evaporating dish after it cooled. Does it'south temperature affect it's mass?

Yes, temperature afects mass, but non enough and so that yous'd notice in a laboratory undergoing chemical reactions with a remainder.

You lot might be able to measure the differences if you lot were doing nuclear reactions rather than chemical ones, but it'southward hard to contain the resulting plasma in a typical gear up of laboratory beakers :-).

TheShapeOfTime

I can only think this is a safety measure. Likewise, depending on what kind of balance y'all are using, weighing something that'due south hot may give a faulty reading or might fifty-fifty harm the balance. Do you use a metal balace which uses moments or a digical balance which uses springs ? And I'll repeat :Temperature does not impact mass directly.
In your particular instance, information technology would be more authentic if yous weigh the dish while still niggling hot. When the copper sulfate cools, being slightly hygroscopic, it will starting time to re-absorb moisture from the atmosphere. If yous await too long for it to cool, it may take re-absorbed a considerable amount of moisture that your calculation will yield an underestimate.

The substance was left in a desiccator, which would probably keep it from re-arresting moisture (another question nosotros were asked

). Possibly information technology's best to answer the question maxim the temperature could touch the mass? I can't see any other possible reply... any ideas?

russ_watters

The warm dish can create convection (airflow), which affects the scale'due south reading.

Gokul43201

The substance was left in a desiccator, which would probably keep it from re-absorbing moisture (another question we were asked ). Perchance it'southward best to answer the question proverb the temperature could touch the mass? I tin can't see any other possible reply... any ideas?

The only direct influence on mass will be likewise minor to measure on any lab scales.

The only way you lot can bear on the mass in your experiment is by adding or removing something to the test substance. If you can find a mode for the loftier temperature to exist responsible for adding or removing fabric, then just would the reply be 'yeah'.

If I was conducting a loftier school chemical science lab with the question yous've got, I'd requite a full grade to anyone that said 'no', or if someone saying 'yes' can explain why.

TheShapeOfTime

I tin can now answer this question, thanks!

Ayham Sallah

I recollect that temperaturte doesn't touch on mass, merely it do impact wieght of the body.
becuase if nosotros put a piece of fe above a scale, we can consider that its weigh represent the pressure level excerted form it onto the scale, and when the tempreture gets raised, the movemnt of molecules of the everyman role of the iron mass increases, this would raise the pressure excerted from the iron onto the scale, and would brand the calibration enhance the value of the weight of the body.
here I remember that it's the aforementioned as "increasing the temperature of gaz increses its pressure", its likewise increasing the temperature will increase the weight of any mass considering of the incresed number of molecules of the trunk which hit the scale and cause it to raise the value of the weight of the body.
but i don't think that it raises the mass...

Buckleymanor

I recall that temperaturte doesn't affect mass, but it do touch on wieght of the torso.
becuase if we put a piece of atomic number 26 above a scale, we tin consider that its weigh stand for the pressure level excerted form it onto the scale, and when the tempreture gets raised, the movemnt of molecules of the everyman role of the iron mass increases, this would raise the pressure level excerted from the fe onto the calibration, and would make the scale heighten the value of the weight of the body.
here I call back that information technology'southward the same as "increasing the temperature of gaz increses its pressure", its also increasing the temperature will increase the weight of any mass considering of the incresed number of molecules of the body which striking the scale and cause information technology to enhance the value of the weight of the trunk.
but i don't recall that it raises the mass...

Equally Pervect has explained an increase in temperature results in an increase in mass though a balance scale would not be sensitive enough to show the slight increment.
By increasing the temperature you are adding energy to your slice of iron and then it would exist slightly more massive than when it was cold.
Much the same way as a charged battery is slightly more massive than an uncharged one.
This amount is teeny weeny and likewise small-scale to measure with a normall scale.

cragar

you could calculate it , using Q=mct
c= specific heat
m= mass
t= change in temperature
and so employ this increment in temperature and divide it by c^two (speed of light) and get your mass increase, which would exist very small-scale.

quantum123

[tex]Eastward=mc^2[/tex]

Equally temperature rises, the kinetic energy of the molecules rises, co-ordinate to the Einstein's equation, their masses must rise.

Buzzworks

[tex]E=mc^2[/tex]
As temperature rises, the kinetic energy of the molecules rises, according to the Einstein's equation, their masses must ascent.

I guess this is the kinetic free energy relative to the speed of calorie-free as well as the 'base of operations free energy' of the object earlier it was heated. In that instance, for normal laboratory tests, the increased mass would be incredibly tiny. You lot'd have to heat the body high enough to emit gamma rays to observe any alter.

I think it might be possible to utilize this principle into a 'directed energy' space propulsion system. Or simply accelerate charged particles at very close to lite speed and slow them magnetically at some betoken in the accelerator. Exhaust would exist a loftier energy beam consisting of X-rays and/or gamma rays.

followert316

what about subzero, the complete absence of heat?

DrDu

The problem when weighting a hot dish is non that it's mass is changing but that:
a) The mass of the hot air in the hot dish is lower than that of the cold air in the cold dish.
b) The density of the hot dish is lower than that of the cold dish due to thermal expansion whence the hot dish has a college buoyancy in the surrounding air.

followert316

if your aim is to observe the gravity of electrons at different temperatures, you volition need a very controlled environs, im not certain that a petry dish would be considered in such an experiment as you would interruption your petry dish when it reaches it's tolerance considering you lot either would need a style to measure the gravity created by a large explosion or a way to succeed in full refrigeration, a process that, if successful, would create dark thing, destroying your entire lab by completely halting every electron and altering every molecule affected into a unified state of null mass, so probably better off trying to mensurate the gravity of an atom bomb equally it is more anticipated and possible than halting electrons

M Quack

Weighing the empty dish before and after the experiment is only expert lab practice. If the readings are dissimilar then the dish was not make clean/dry earlier the experiment or something else got screwed upwards.

The direct effects of temperature on the weight are fairly pocket-sized and accept been listed above.

HallsofIvy

The reason for waiting for the dish to cool is to reduce air currents around the plate and balance that could affect the result.

Does Mass Change With Temperature

Does temperature affect mass?

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