冷縮熱漲玻璃球??急..!!!!!!!!

This is NOT because of low boiling point. If it was, you would not see the liquid shooting up into the upper glass bulb. Instead, you would see vapour fume coming from the liquid. Moreover, vapourization needs quite an amount of heat energy (the latent heat of vapourization), I wonder if merely the warmth from human palms could provide such qunatity of heat energy.

The mechanism is probably due to thermal expansion. The liquid has a very high coefficient of expansitivity (expansitivity is defined, in physics, as the ratio of change of liquid volume to the original liquid volume per degree rise in temperature).

The heat from the palms warms up the liquid in the lower bulb, the liquid expands rapidly and increase in volume. At the same time, the air inside the bulb is also heated up and tends to increase in volume. Because the volume is fixed by the glass bulb (expansitivity of glass is usually low), this leads to an increse of air pressure, thus forcing the expanded liquid into the upper bulb, which is seen as a [shooting effect] of the liquid.

我估計，球裏面既液體係一啲沸點較低既液體如係沸點為34.6度攝氐既乙醚。

因為呢類液體既沸點較低，所以當你用手心接觸下面載有液體既玻璃球，你手心既散發既熱能足以令液體被加熱至沸點，繼而蒸發到上面既玻璃球，但亦因為液體本身既沸點較低，所以上面既玻璃球既溫度只達室溫既程度已足夠令液體重新凝結。

不過，因為見唔到個儀器既真實外觀，所以只能咁樣稍作推斷。

希望可以幫到你啦。