CHAPTER 2. ATMOSPHERIC PRESSURE
And if the whole room were a vacuum and you turned on the telly you'd be warmed Perhaps the question was meant to be; what is the temperature of space?. Vacuum is space devoid of matter. The word stems from the Latin adjective vacuus for "vacant" . The vacuum of classical electromagnetism can be viewed as an idealized electromagnetic medium with the constitutive relations in SI units: The thermosphere in this range has large gradients of pressure, temperature and. A vacuum doesn't affect temperature, as such. If there were a . The vacuum temperature is mediated by radiation that falls through the space.
If vacuum is cold how does a vacuum flask keep drinks hot? If it is hot how does it keep things cold? The evidence of our everyday experience seems to lie with those who say vacuum is impervious to temperature. Quentin Langley, Woking Iin my experience, if you run over a ball of wool, a vacuum can become hot enough to melt through its power cord and fuse the downstairs of a semi-detached house. Guy, Manchester, UK Quentin is no doubt confused by the idea that a vacuum could be cold or hot and also the idea that vacuum flasks would some how know!!
As I see it the question is basically academic, since a vacuum is an empty space it cannot conduct or convect heat, radiated heat will pass through but won't affect it since there's nothing in the vacuum to take up the energy.
Vacuum flasks work because they reduce the transfer of heat by conduction and convection.
What happens to an astronaut's body temperature in space?
They're not perfect because a You can't make a perfect vacuum b Radiated heat passes through undisturbed. A vacuum basically has a temperature of 0Kelvin as stated earlier, a zero energy state.
Stick a thermometer in and the thermometer will heat up according to the radiated heat passing through, this however doesnt measure the vacuum temp, as thermometers work on the basis of conduction of heat from the medium you want to measure. The NBMR that permeates the universe could be said to raise the temp above absolute zero other than that the perfect vacuum has no Kinetic energy and therefore zero temperature.
- Outer space
Paul Norton, Worthing Further to the previous replies: The specific heat of water is 4. So my hypothesis that there is not enough heat available to vaporize all the water is correct, as only about one sixth of the water can be vaporized with the available heat.
The ratio between the two part is inversely proportional to the specific latent heat for freezing and vaporizing. These figure are very approximate.
The ratio divides the remaining 4. And it all happens rather quickly.
I was actually uneasy about this account of astronauts stories of water boiling and then desublimating at once, because that would leave us with all the heat to get rid of very quickly. Does anyone have a better account? A last remark is that there always will be some part of the water that gets frozen. Turning on a fan on a hot day can speed up the process and cool you down quicker as the air passes over and whisks some of the body heat away.
On the International Space Station there is no convection because of weightlessness and astronauts have reported feeling hot since the earliest days of spaceflight.
Outer space - Wikipedia
The Thermolab experiment was born, but first a practical problem needed to be overcome. Professor Gunga explains the temperature sensor used in the Circadian Rhythms follow-up study Depending on where and when you measure your temperature a thermometer will give a different reading.
Your body temperature is lower in your feet and lowest between four and six in the morning. Researchers and doctors refer to core body temperature — the temperature in your chest — to compare readings.
Measuring core body temperature is not straightforward because a thermometer must be placed as close to your heart for best results.