Is a hot object heavier than the cold one?

Franklin 09/09/2018. 13 answers
Science & Mathematics Physics

13 Answers

Tom S 09/13/2018.

No, hot air balloons float better than cold air balloons, so they weigh less (lighter than air), as one example.

goring 09/12/2018.

In the same gravity field two one kilogram mass weighs the Same.

However if one mass is injected by massive radiation it will contain more mass than the cold one.

That means as the temperature of an atom increases, its mass will also increase accordingly.

Atoms are in a continuous mass change; the stability of an atom vacillates between the points of equilibrium.

A cold potato will always weight less than a hot potato.

oldprof 09/11/2018.

That's the claim. Why? Because the higher energy content adds just a smidgen of rest mass to the object. And therefore the pull of gravity is acting on a slightly heavier mass giving that object more weight than its cold version would have.

Jim Moor 09/10/2018.


Here's why, look at your question: "Is a hot object heavier..."

"Heavy" is defined as "force"

Force = mass * acceleration

That's it

neb 09/10/2018.

Yes, but by an almost infinitesimal amount. Mass/energy is more complicated in general relativity involving not just energy density, but momentum density, pressure, and stress. If you have two identical objects, the hotter one will have more energy, therefore more gravity. Note that you should think in terms of energy rather than mass since they really aren’t the same thing. They have an equivalence, but mass does not increase, energy does.

sojsail 09/10/2018.

If we suspect that energy HAS mass, should we expect that the mass would increase if we give it more gravitational potential energy?

I can't see it, but ... there are many accepted Physics theories that I can't see.

Vaman 09/10/2018.

Yes. It should. Mass is proportional to the energy. Energy of a mass m = mc²+ n kT

n is the number of particles, k is the oltzmann constant and T is the temperature. According to this mass increases with energy. This is also seen in the relativity also.There the kinetic energy plays role of kT.

Anonymous 09/10/2018.

Yes, adding heat to an object will double it weight per degree.

Where does this stupid **** come from.

flyingtiggeruk 09/09/2018.

Its density may reduce marginally if it expands, but the mass will be the same.

Kevin7 09/12/2018.

If there is a weight difference such a difference would only clearly detectable to current human technology on a very big object like a star. or a quasar .Albert Einstein did say Energy is mass,so i understand your logic

Doc Awesome 09/12/2018.

By weight, not generally. Yet, because most heated objects expand by volume, its overall mass may to some degree, be changed. There are cases where charged particles can be absorbed by objects and those ions may transfer their unstable charge to object open to gaining electrons and increase its atomic weight. Further, bombarding elemental lead with energetic protons in a collider can cause some of them to fuse into the atomic lead nuclei and transform them into gold atoms. Those are heavier atoms, thus a slightly heavier material is created from the process along with a lot of relative heat.

Smelting processes also infuse iron molecules with carbon and other elements to create alloys. Since the alloys are compound materials, they are heavier (slightly) than the iron in pure state would be.

Andrew Smith 09/10/2018.

This is a very interesting question. We are not able to measure it with enough precision.

But one argument is that energy HAS mass. A different one is that mass is CONVERTED to energy.

If the first was correct then the mass should increase by the mass of the energy.

If the second, current, view is correct then the mass should not be altered at all ie the energy has no mass itself.

If we were able to measure the mass with sufficient precision it would support one or other of these views but must contradict the other one of them.

I would love to be able to do the experiment and get an answer now instead of building ever more physics on an untestable foundation.

Julien 09/09/2018.

Please be more specific. You mean the same object in both cases but put at different temperatures?

Then the object is marginally heavier when it's hot, something like deltaM = N*kB*deltaT/c^2, but I can't think of any "real-life" or industrial situation in which it would be non-negligible. - Download Hi-Res Songs

1 Katy Perry

365 flac

Katy Perry. 2019. Writer: Zedd;Katy Perry;Caroline Ailin;Corey Sanders;Daniel Davidsen;Cutfather;Peter Wallevik.
2 5 Seconds Of Summer

Who Do You Love flac

5 Seconds Of Summer. 2019. Writer: Andrew Taggart;Talay Riley;Oak;Sean Douglas;Luke Hemmings;Calum Hood;Ashton Irwin;Michael Clifford;Trevorious;Zaire Koalo.
3 Brooks

Better When You're Gone flac

Brooks. 2019. Writer: David Guetta;Emma Lov Block;Ido Zmishlany;Jackson Foote;Jeremy Dussolliet;Brooks.
4 Ariana Grande

7 Rings flac

Ariana Grande. 2019. Writer: Ariana Grande;Richard Rodgers;TBHits;Njomza;Michael "Mikey" Foster;Kaydence;Tayla Parx;Scootie;Oscar Hammerstein II;Victoria Monét.
5 Bruno Mars

Please Me flac

Bruno Mars. 2019. Writer: J. White Did It;DJ White Shadow;Philip Lawrence;Bruno Mars;Cardi B.
6 Avril Lavigne

Dumb Blonde flac

Avril Lavigne. 2019. Writer: Mitch Allan;Bonnie McKee;Nicki Minaj;Avril Lavigne.
7 Alec Benjamin

Let Me Down Slowly flac

Alec Benjamin. 2019. Writer: Alec Benjamin;Sir Nolan;Michael Pollack.

Happy flac

DEAMN. 2019.
9 Ariana Grande

Needy flac

Ariana Grande. 2019. Writer: Tayla Parx;TBHits;Victoria Monét;Ariana Grande.
10 Halsey

11 Minutes flac

Halsey. 2019. Writer: Matt Schwartz;Halsey;Dominic Harrison;Brynley Plumb.
11 Lauv

I'm So Tired flac

Lauv. 2019. Writer: Lauv;Michael Pollack;Troye Sivan;Leland;OZGO.
12 Ariana Grande

Break Up With Your Girlfriend, I'm Bored flac

Ariana Grande. 2019. Writer: Kandi;Kevin "She'kspere" Briggs;Max Martin;ILYA;Savan Kotecha;Ariana Grande.
13 Bebe Rexha

Last Hurrah flac

Bebe Rexha. 2019. Writer: Andrew Wells;Nick Long;Lauren Christy;Bebe Rexha.
14 Afrojack

Ferrari flac

Afrojack. 2019.
15 Icona Pop

This Is How We Party flac

Icona Pop. 2019. Writer: R3hab;Icona Pop.
16 Armin Van Buuren

Lonely For You flac

Armin Van Buuren. 2019. Writer: Armin Van Buuren;Bonnie McKee;Eden XO;Benno De Goeij.
17 Normani

Dancing With A Stranger flac

Normani. 2019. Writer: Mikkel S. Eriksen;Tor Hermansen;Jimmy Napes;Normani;Sam Smith.
18 Julian Jordan

Need You flac

Julian Jordan. 2019.
19 Fall Out Boy

I've Been Waiting flac

Fall Out Boy. 2019. Writer: Andy Hurley;Patrick Stump;Pete Wentz;Joe Trohman;Lil Peep;​iLoveMakonnen.
20 Ariana Grande

Imagine flac

Ariana Grande. 2019. Writer: JProof;Priscilla Renea;Happy Perez;Andrew "Pop" Wansel;Ariana Grande.