You have a glass jar. You pour in water with a pitcher until it is half filled. You then seal the jar with an air-tight lid. (The only other thing in the jar is regular air). Assuming that the water in the jar is not already boiling after attaching the air-tight lid, how do you make the water boil?
boiling: the state in which liquid water is rapidly changing to water vapor (ie, the water is accually bubbling, not just steaming)
For clarification, the water is plain distilled H20. It is not heavy water, water with impurities, etc...
You cannot transfer or use anything that transfers light, heat, magnetic, electric, or chemical energy into the jar. (and no, shaking the jar till the water friction causes the water to boil does not work)
You cannot open or break the glass jar.
The area in the jar cannot increase or decrease. (You can try but the jar will not shrink, grow, or deform in any way)
You cannot insert anything into the water.
You must be able to conduct this experiment with easily attainable equipment, chemicals, and other materials. (ie, no radioactive chemicals, no superpowers, no multi-million dollar scientific equipment, you get my drift...)
(Note: although it is hard for it to succeed, you can conduct this experiment at home and get the water to boil without any special equipment.)
(In reply to
re: Just a guess by Larry)
insofar as the S4TD solution goes, I don't think so... removing heat
from the jar, while having a (possibly) measureable impact on the air
pressure and therefore the boiling point, would have a much greater
effect on the water termperature, more than enough to compensate for
the lower boiling temperature. Unless the lid is too far away to
suck any heat out of the water - though then that (as the jar is half
full) would imply a large jar requiring a large change to affect the
respectively large volumes of air and water.
As for the superheating method, the text of the problem to me initially
defied this solution. As soon as superheated water is disturbed
in any way it will rapidly boil - certainly ytou can't pour superheated
water from one vessel to another without this disturbance.
However, the problem doesn't state that you can't heat it after you
pour it into the jar, so maybe...
re(2): Just a guess
