Freezing at Work

Teaching Learn to Swim is a tough job. You get sick often and your attendance at work has to be consistent with as little interruption as possible since there are significantly low staff numbers. Unlike working at coles, where employees are like ants and are everywhere. Swimming Instructors cause great distress when one of them can't come to work. Today I taught at like 12:30 and was meant to be able to go home by 2:30, and by that time I was already out of my gear. But I was told to do an assessment at 3:15 and then was told to start the squads off because another teacher was outside doing another class and was behind. Then my boss tells me she wants me back in the water for 2 hours because another instructor was sick. So I reluctantly agreed and I hadn't had a chance to eat lunch yet so all I had eaten all day was 2 bowls of cereal and 3 eggs at like 10:30 or something. So my energy levels were rock bottom, and I was absolutely freezing, like struggling to speak coherently cold. My voice was shaking from the coldness... So I was in the water till 5:30... and I was hungry as heck. Unlike other jobs where you can eat on the job, you can't eat in the water (obviously) and even though your surrounded by water, you can't actually drink it. And since you lose energy at more than 4x in air... you just yer... die lol...

If we did chemistry, we know that the heat capacity of air is 1.012. Or if we use the volumetric heat capacity of air, it is 0.001297/ml. The volumetric heat capacity of water is 4.186/ml... The surface area of an average male is 1.9m^2, and if we multiply that by 0.01m just to consider the volume of stuff surrounding us, we have 0.019m^3 of space surrounding our body. If we convert that to cm^3 to make calculations easier, we get 19000cm^3 I think... (I'm just doing this off the top of my head)... so if the energy required for the body to heat up just the water touching your skin which is the 19000cm^3 of water, assuming the water is 28C and the body is 37C would be E=19000*4.186*9 (now I need a calculator) which equals 715.806 kJ. The same equation done with air would be E=19000*0.001297*9=221.787 J

Which means that room temperature water is 3227.44 times colder than room temperature air. Which means that you lose energy 3227.44 times faster when submerged in water than when you are in air. 28C air is quite comfortable as your body does not need to use much energy to maintain core temperature, in fact it's actually quite hot. 28C water is extremely cold if you are not exercising. Also remember that the water around you is constantly moving which means that the water that warms up around you gets washed away and you get cold again and continue losing heat. I had no energy left after not eating since breakfast so I was cold, very cold.

If the water was to be made to the level of comfort as if your in 21C A/C (E=19000*0.001297*16=394.288J) the water temperature would need to be body temperature (36.995C). I haven't done maths and chemistry in ages lol... But I still remember how to calculate this stuff. And water is cold stuff...

Neways... enough from me...