Evaporation (or another word to use is water vapor.)
C. when you can't achieve your goal due to events beyond your control
............................................................................... Hello wonderful person <3
Its readily available
No Harmful emissions
Environment friendly
Renewable
Hydrogen isn't very good fuel source due to its high flammability and can create a nasty mini hydrogen bomb. <span />
E=mc² where c is speed of the light
3 m/s more andmore less than speed of the light. So mass of the person still 100 kg