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I would like to have the answers in short abou t the following :
a) Why asteam burn is worse than a hot water burn?
b) A pressure cooker cooks food faster
c) A car cooling system is usually pressurized
d)An astronaut needs a pressurized space suit all round his body
e)It is difficult to make tea on Mount Everest
f)Wet clothes feel cold
g) Tea is cooled more rapidly by blowing on it
h) Atheletes should put on a tracksuit soon after finishing a race
i) A swimming pool is colder on a windy day
a. see above
b. pressure increases energy which in turn increases the "heat" used for cooking
c. There are several reasons google them.
d. There are several reasons. Temperature, oxygen circulations, look up nasa.gov
e. Yes, because usually the tea is frozen and there is no electricity.
f. Because when water evaporates it is an endothermic reaction. It absorbs heat for it to turn from water to water vapor. Water can also "hold" lots of heat.
g. When you blow cold air at anything it tends to "carry" off heat.
h. Don't think this is really needed other than to help save time.
i. Water absorbs large quantities of heat without having massive changes in temperature.
j. Why ask these questions?
For e), it's actually because at a lower pressure the boiling point of water is lower. Because of this it will boil at a lowere temperature and it will be inpossible to make hot water. The water will boil off before it becomes hot enough for a good cup of tea
a) Actually steam is NOT hotter than water. Steam and water can both exist at 100 degrees Celsius. A steam burn is worse than a hot water burn because the steam is in a different phase. When the steam comes in contact with your body, the steam must turn into water before it can cool down to body temperature. This releases more energy into the skin due to the phase change, thus causing a worse burn.
d) A non-pressurized suit would still keep in oxygen and could regulate temperature. In space there is no pressure. Your body is specifically designed to deal with atmospheric pressure. Your cells push out with the same pressure as the atmosphere. If you go to space (Where there is no atmosphere) your cells will still push out and start to explode. You would die. You need the pressurized suit to simulate the atmosphere.
a) Actually steam is NOT hotter than water. Steam and water can both exist at 100 degrees Celsius. A steam burn is worse than a hot water burn because the steam is in a different phase. When the steam comes in contact with your body, the steam must turn into water before it can cool down to body temperature. This releases more energy into the skin due to the phase change, thus causing a worse burn.
Depends whether you mean "hot" as in temperature, or "hot" as in heat energy. I would say that steam is hotter than water (pour some 100C water on your arm and spray some 100C steam on your other arm and tell me steam isn't hotter). Even though they are at the same temperature, steam has more heat energy, which I would term as being hotter.
a) Actually steam is NOT hotter than water. Steam and water can both exist at 100 degrees Celsius. A steam burn is worse than a hot water burn because the steam is in a different phase. When the steam comes in contact with your body, the steam must turn into water before it can cool down to body temperature. This releases more energy into the skin due to the phase change, thus causing a worse burn.
d) A non-pressurized suit would still keep in oxygen and could regulate temperature. In space there is no pressure. Your body is specifically designed to deal with atmospheric pressure. Your cells push out with the same pressure as the atmosphere. If you go to space (Where there is no atmosphere) your cells will still push out and start to explode. You would die. You need the pressurized suit to simulate the atmosphere.
g) Convection
You can circulate oxygen in a non-pressurized suit in a vacuum? How? You are right about the steam thing. Physically it releases energy when it converts to back to water.
You can circulate oxygen in a non-pressurized suit in a vacuum? How?
Well technically you could have an external tank that supplies the oxygen. I realize that this is not how it is done with actual suits as they serve multiple purposes, but a pressurized tank would allow for oxygen circulation. There are actually a couple of really good sites out there that discuss all the functions of a space suit if anyone is interested. One good one is ....
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