Lakini kwa kipimo cha kelvin kuna absolute zero(at least from thermodynamic point of view)! So baridi mara mbili ya 0 deg centigrade naamini itakuwa kama -136.5 deg centigrade!Ni hv!vpm vya joto vyote vp ktk ratio scale,na moja ya sifa kubw ya vpm hv n kwmb hvn absolute zero,so haviwez kuzidishwa!
Kama baridi ya leo ni nyuzijoto sifuri na tunatarajia kesho kutakuwa na baridi mara mbili ya hii ya leo, je baridi ya kesho itakuwa nyuzijoto ngapi?
Lakini kwa kipimo cha kelvin kuna absolute zero(at least from thermodynamic point of view)! So baridi mara mbili ya 0 deg centigrade naamini itakuwa kama -136.5 deg centigrade!
Sasa huyu ndio alikaribia kunichanganya mwanzoni ila baadaye nikmuelewaHello, and thanks for writing to Dr. Math. You pose a very interesting question. What is the temperature if it's twice as cold as zero degrees? The Fahrenheit and Celsius temperature scales are "relative" temperature scales, in that they are both relative to a couple of specific temperatures, namely the freezing and boiling points of water.
Let's make your question a little more specific: "What is the temperature if it's twice as warm as 0 degrees Celsius (the freezing point of water)?" To answer this question we need to convert this Celsius temperature to an "absolute" temperature scale, a scale with no negative temperatures. We'll use the Kelvin scale.
0 degrees Kelvin is the point at which all motion in matter stops; it is known as "absolute zero." No temperature can exist that is lower than 0 degrees Kelvin. The formula to convert from Celsius to Kelvin temperature is K = C + 273.15, where K is the Kelvin temperature and C is the Celsius temperature.
So 0 degrees Celsius is equal to 273.15 degrees Kelvin. We can double this number to get 546.30, the temperature that is twice as warm as 0 degrees Celsius.
We can then subtract 273.15 from our answer to convert it back to the Celsius scale. The temperature is 273.15 degrees Celsius when it is twice as warm as 0 degrees Celsius. Makes perfect sense, doesn't it? ..............................
source Math Forum - Ask Dr. Math
So kichemsha bongo sikuwa na jibu. but ubongo umechemka na kuwa active. na gaijin naona ni mtaalam
There is no really good answer to this question; the term "twice as cold" is not well defined. A physicist might want to define it one way, but someone deciding what to wear would have good reason for defining it in a very different way.
To the best of my knowledge, no one has actually defined it quantitatively, in either of these ways or any other way. Still, I will tell you my ideas on two ways "twice as cold" *could* be defined if you insisted on doing so. "Cold" is confusing in the same way that "short" or "small" is confusing. If I say that I am twice as short as you, what I probably mean is that I am half as tall as you. It isn't really a good way to talk at all; it's best to say "half as tall" because it's less confusing.
"Cold" is even more confusing than "short" because temperatures can be negative, but height can never be negative (not the height of a person, anyway). If "twice as cold" means "half the temperature", then if the temperature is negative, "twice as cold" is *warmer*! For instance, half of -10 degrees is -5 degrees, which is warmer than -10 degrees. If "twice as cold" meant "twice the temperature", it would go in the right direction for negative temperatures, but not for positive temperatures.
Then, too, there's the problem that "twice as cold" will mean different things depending on whether you are using the Celsius or Fahrenheit scale. "Twice as cold" as 0 C is 0 C, but 0 C is 32 F, and half of this is 16 F, which is -8.9 C. One solution is to choose a meaningful zero point for temperature.
Physicists determined that temperature has to do with how much energy there is in the air (or whatever you're taking the temperature of.) This energy is all gone when you get down to a temperature of -273.15 degrees Celsius, or about -460 degrees Fahrenheit. This temperature is called "absolute zero."
The scientists then invented two new temperature scales: Kelvin, which is the degrees C plus 273.15, and Rankine, which is the degrees F plus 460. That means that 0 degrees on either scale is absolute zero. Therefore I propose that if you insist on saying "twice as cold," we should mean this by it: "half the temperature on the Kelvin (or Rankine) scale." By this definition, "twice as cold as 0 C" is half of 273.15 K, which is 136.57 K. Converting this back to Celsius, we get -136.58 C. That's very cold. I don't think it will ever be "twice as cold as 0 degrees" in either Fahrenheit or Celsius.
This definition of "twice as cold" might satisfy a low-temperature physicist, who is concerned about the amount of energy in a substance, but it does not agree with our everyday idea of cold. Our everyday use of "twice as cold" might be something like, "It's so cold that I need to wear twice as much clothing."
If I wanted to invent a mathematical meaning for "twice as cold" that would fit this idea, I would pick a temperature that is neither warm nor cold, perhaps 65 F. Then "how cold it is" would mean "how many degrees below 65 F," and "how hot it is" would mean "how many degrees above 65." Then 45 F would be "twice as cold" as 55 F, and -65 F would be twice as cold as 0 F. (That's still very cold!) You can see that this is a very different definition from the first one.
It makes more sense according to our everyday idea of cold, but it has one problem: some international agency has to set that "neither cold nor warm" temperature. Judging from the battles some families have over thermostat settings, I don't think this will be easy! So I say again, I would rather avoid the phrase "twice as cold" altogether.
Kiranga, ushajipigia kura?
kwa physics point of view, upimaji wa joto (baridi) unategemeana na energy kwenye kimiminika (in this case air) kinachopimwa. Kwa hiyo lazima tuangalie masuala ya absolute zero kama alivyosema SMU hapo juu.
Kama tutahusisha na absolute zero basi tutalazimika kubadili kwenda kwenye Kelvin kwanza kisha ndo kurejesha kwenye Celsius.
Twice as cold as 0 Centigrade is -136.58 Cenrigrade 🙂)
Sioni umuhimu wa kuingiza absolute zero wakati ushapewa joto kama 0 C, kuingiza absolute zero kuta serve purpose gani mtaalamu wangu?
" By this definition, twice as cold as 0 C" is half of 273.15 K, which is 136.57 K. Converting this back to Celsius, we get -136.58 C. That's very cold. I don't think it will ever be "twice as cold as 0 degrees" in either Fahrenheit or Celsius.
Sioni umuhimu wa kuingiza absolute zero wakati ushapewa joto kama 0 C, kuingiza absolute zero kuta serve purpose gani mtaalamu wangu?
Je ukiweka theory za physcis na hesabu pembeni ni kweli practically -136.58 C ndio mara mbili ya 0 C. ??????!!!!!!!
Hapa nashindwa kuchanganyikiwa
Zero°C ni kama Benchmark kwenye mambo ya Ujenzi, Survey au Geografia. Hii point ijulikanayo pia kama POINT OF REFERENCE, huwa inachukua vitu kama urefu wake kutoka usawa wa bahari, umbali kutoka sehemu hiyo kwenda nyingine nk...
Sasa ukija kwenye 0 °C, hii ni kama Point of Reference katika mambo ya MOTO vs BARIDI. Vitu vyote vinaanzia hapa. Ukitaka kupima kitu chochote joto lake, basi unaanzia hapa. Ukisikia -X °C, basi unafahamu kuwa ni units X kutoka kwenye 0 kushuka chini na ukisikia +Y °C basi unafahamu kuwa units Y kutoka 0 kupanda juu. Hii ni point of reference na huwezi tena kuigusa katika kupima kwako.
Kwa Dar, Point of Refence ipo pale kwenye Mnara wa Saa. Sasa hapo ndipo siku zote wanaanza kupima umbali kutoka Dar es salaam kwenda mikoani na hata nchi nyingine duniani. Swali lako SMU ni sawa na kutaka kujua umbali kutoka hiyo Point kwenda kwenye hiyo point ukizidisha mara mbili ambapo jibu utapata ni Zero.
Ili kuthibitisha hilo jibu kuwa itakuwa 0°C na kubaki pale kwani hii ni Benchmark, tuangalia hii hesabu hapa chini:
Tufanye kwenye -1°C mara mbili itakuwa -2°C............. -0.00005°C mara mbili yake itakuwa -0.00010°C
Kwa kuangalia tabia yake hii, baridi inavyokaribia 0°C, basi mara mbili yake pia inakaribia 0°C.
Sasa practically ndio kitu gani wakati jibu ndo hilo ushapewa la uhakika. 😀
Ukiondoa Physics na Hizo hesabu najaribu kuhisi kama kweli ubaridi wa -136 C ndio mara mbili ya ubaridi wa 0 C
Kama baridi ya leo ni nyuzijoto sifuri na tunatarajia kesho kutakuwa na baridi mara mbili ya hii ya leo, je baridi ya kesho itakuwa nyuzijoto ngapi?
Majibu:
1. nyuzi joto sifuri ( 0 centigrade)
0 centigrade ni sawa na 32 Fahrenheit.. Mara mbili ya 32 ni 64 Fahrenheit.. Ukibadilisha 64F kwenda kwenye centigrade inakuwa ni 18 Centigrade..
Kwa hiyo mara mbili ya 0 Centigrade ni 18 Centigrade.
2. nyuzi joto sifuri ( 0 Fahrenheit )
0 Fahrenheit ni sawa na -18 Centigrade.. Mara mbili ya -18C ni -36C. Ukibadilisha -36 kwenda kwenye Fahrenheit inakuwa ni -33 Fahrenheit..
Kwa hiyo mara mbili ya 0 Fahrenheit ni -33 Fahrenheit.