Finally 8 000 000 000!

Finally 8 000 000 000!

These days, in the middle of November 2022 the population of Earth just reaches 8 000 000 000. For us humans, it is a nice round number having 9 zeros in it (having 10 fingers on our both hands, probably therefore using the base-10 (decimal) number system). Fun fact: sloths (3 fingers on one hand,…

Energy of showering

Did you think about how much energy is needed for a refreshing hot shower? Let us see… You need to know some input data: how much water you use (for example 16 l/min), some physical property of water (heat capacity =4200 Joule/kg/Celsius, density = 1kg/l) the input water temperature supplied to your heater the outlet…