According to an encyclopedia,it says that a vacuum flask does not allow heat transfer by any of the three ways that heat could travel,while another one says that the Sun's heat reaches the Earth's surface through a space vacuum.
2006-06-06 03:08:02 · 10 answers · asked by boonkwantung 2 in Science & Mathematics ➔ Physics
heat radiation is possible in a vacuum, thats how the suns energy reaches us
2006-06-06 03:13:00 · answer #1 · answered by mfem.geo 2 · 1⤊ 0⤋
Recently I was doing an experiment and came across with this question. I found this answer to be apt from http://helios.gsfc.nasa.gov/qa_sp_ht.html
Does Heat Travel Through a Vacuum?
Does heat travel through a vacuum, and if so how? If not, how does the Sun heat the Earth?
Heat travels through a vacuum by infrared radiation (light with a longer wavelength than the human eye can see). The Sun (and anything warm) is constantly emitting infrared, and the Earth absorbs it and turns the energy into atomic and molecular motion, or heat.
Dr. Eric Christian
2015-11-16 19:04:26 · answer #2 · answered by Anonymous · 0⤊ 0⤋
There are 3 ways for heat to travel:
conduction
convection
and radiation.
A vacuum flask minimises the first two by having a vacuum between its inner and outer walls, and minimises the third by having a polished interior which reflects heat back into the container.
The Sun's heat cannot reach us via convection and conduction because they don't work across a vacuum; but radiation (of heat, light and other electromagnetic waves) can travel through a vacuum.
2006-06-06 05:56:25 · answer #3 · answered by Anonymous · 1⤊ 0⤋
How Does Heat Travel
2016-10-15 23:53:24 · answer #4 · answered by Anonymous · 0⤊ 0⤋
The sun's rays (light) travels through space, not heat. When the light strikes the surface of the earth it converts into partial heat energy warming up the world.
2006-06-06 03:13:16 · answer #5 · answered by gutuku 2 · 0⤊ 0⤋
Yes,by radiation. Otherwise how do you think the solar energy would reach us as rightly pointed out by you yourself
In a vacuum flask radiation loss is minimized by polishing
2006-06-06 03:29:23 · answer #6 · answered by raj 7 · 0⤊ 0⤋
infra red rays(electro magnetic radiation) or heat need no medium they can travel through vaccum
in a flask they are reflected by the silver polisihing inside and there is a vaccum in a flask
sun rays contain infra red rays or heat
go to wikipedia.com and see the structure of a flask
2006-06-06 05:36:06 · answer #7 · answered by deep 2 · 0⤊ 0⤋
Yes, thermal radiation can pass through a vacuum.
All other forms of transmission of heat are essetially mechanical, and so they require the hotter body to be in direct or indirect (via a fluid or gas for instance) physical contact with the colder one for heat to be transmitted.
2006-06-06 03:13:28 · answer #8 · answered by Epidavros 4 · 0⤊ 0⤋
All Elecrto-magnetic radiation pass through vacuum.
Heat radiation is Infra-red radiation. Infra rec radiation is one of electromagnetic radiation like light.
Therefore heat radiation passes through vacuum.
2006-06-06 05:35:33 · answer #9 · answered by Pearlsawme 7 · 0⤊ 0⤋
regular heat is measure by the energy of the molecules and in vacuum there is not molecules so regular heat can not pass in vacuum
2006-06-06 08:45:48 · answer #10 · answered by tal r 1 · 0⤊ 0⤋