Can you float in concrete?

I am about to get buried in concrete and while that's happening I'm going to explain everything you need to know about this substance so the first thing that I want to clear up is the difference between cement and concrete cuz people often mix these up okay cement is like the glue it's the Matrix of stuff oh there I feel it okay that feels good now concrete is cement plus aggregate so plus gravel and sand and this is filling up really rather quickly cement is the most important man-made substance on the planet we use more of it than any other substance apart from water every year 500 kg of cement are created for every man woman and child on Earth and that amount of cement can make two cubic met of conrete which is about two of these big fish bowls this video was sponsored by Ren I don't think people realize just how important concrete is so here's another way to think about it every year we make a certain weight of goods out of copper more out of aluminum and then you have glass asphalt lime iron is a big one for all the steel and then there's ceramic and wood but by far the solid product we make the most of is cementitious material essentially cement we use as much of it as we do all other materials combined and it's easy to see why concrete is liquid rock you can pour it into any shape you like it's strong and durable and inexpensive and it is so easy to produce that people have been making a version of it for thousands of years to make primitive cement the key ingredient is limestone which is basically calcium carbonate if you heat it up to around 1,000° that drives off CO2 out of the rock leaving calcium oxide which is also known as quick lime now if you grind up the calcium oxide and mix it with water you get an exothermic reaction that creates calcium hydroxide which you can pour into a mold and over a time it will absorb CO2 from the atmosphere turning back into calcium carbonate as the water evaporates now that's a pretty good primitive cement it's the first way that people ever made cement but there are several drawbacks to it I mean for one thing you can't ...