WATER
According to Oxford advanced learner’s dictionary, water is a liquid without color, smell or taste that falls as rain, is in lakes, rivers and seas, and is used for drinking, washing, etc. For this third module for the Design II class about water, I do some experiments on water, focus on the transformation of water to gas, ice to water and vice versa.The first experiment I’ve done is about water evaporation. I put the pot on the oven with low heat then pour water in, the water evaporate quickly as usual. But second time, I wait a little longer and increase the heat before pour the water in, this time water didn’t evaporate, but it became bubbles rolling on the pot surface. This phenomenon can be explained as the Leidenfrost effect, it is a phenomenon in which a liquid, in near contact with a mass significantly hotter than the liquid's boiling point, produces an insulating vapor layer which keeps that liquid from boiling rapidly and takes longer to evaporate.
My second experiment is about ice melting to water. This experiment has nothing complicated at all; I just put an ice on a plate still and timing it until it completely melts to water. I take picture of the ice every 5 minutes to see how the mass changes, nothing interesting. In room temperature, the ice takes 23 minutes to melt completely whole cube. It’s amazed me only a bit that I first taught it would melt faster that this as the weather is very hot! I also try putting ice into the heated pot to see how quick it melts, the result is very faster but it produce lots of fog coming out from the ice.
Another experiment is about water transforms to ice. Normally, water transforms to ice when the temperature is at 0°C, called freezing point. But there is an exception if the water is not pure water, like in my experiment, I used soda, the water will not freeze at that temperature and it will still be liquid. Then if you make only a little stimulation to it, it will freeze immediately. This phenomenon is called “supercooling”. In the supercooled state, it remains a liquid despite being cooled well below its freezing point. In my experiment, I first put normal soda into freezer at
-15°C and leave it like that without any disturbance for 5hours. Then I put it out slowly before pulling the lid out, at this moment the stimulation when I open the lid triggered the molecule of the soda which made it freeze immediately. This will happen only when the soda was place in the right temperature; long enough to make it very cold. Moreover, the very important point is that to leave it with out any disturbance, as only a little shake can spoil the phenomenon.
Apart from these experiments, I also try to play with the ice and salt, to see how salt effect on ice. I found that salt first stick on the ice cube then as the ice melt, I see the texture made by salt. Salt eroded ice cube into special texture and also boost the melting, ice melt better with salt added.
I have learned a lot from the experiments I’ve done so far, some of them I never knew before, for example; supercooling. Common element in our lives like water can be transformed by many surprising way. I think all the information and ideas I got from the experiments can be my inspiration in further assignment.
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