Why do ice float?

The other day, while relaxing in Starbucks Cafe with some old friends. I sat looking at my cold drink and wondering why ice float no matter how small or big the size of it. So i ask my friends, just to strike a conversation. Many interesting answers were given. But the most common answer related to chemistry is due to Hydrogen Bonding.

So then we discuss the different defination of hydrogen bonding. As it is a type of intermolecular force between molecules having a H atom bonded to a small highly electronegative atom with lone pairs like N, O and F. With saying that we continue to talk that ice can be also be tough and rigid due to its bonding. To compare the rigidity of the ice, the incident on Titanic came into play.

Soon, we then opened a joke to make the topic livelier.
One of the joke was read on the internet and passed aroung. It was : A student comes into his lab class right at the end of the hour. Fearing he'll get an "F", he asks a fellow student what she's been doing. "We've been observing water under the microscope. We're suppose to write up what we see." The page of her notebook is filled with little figures resembling circles and ellipses with hair on them. The panic-stricken student hears the bell go off, opens his notebook and writes, "During this laboratory, I examined water under the microscope and I saw twice as many H's as O's."

Later, we calm ourselves and continue a cold caramel macchiato.

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