200000 hydrogen atoms has a mass of 201600 atomic mass units (about three haemoglobin molecules), which by e=mc² is about 188 TeV (tera electron volts), which i

200000 hydrogen atoms has a mass of 201600 atomic mass units (about three haemoglobin molecules), which by e=mc² is about 188 TeV (tera electron volts), which is about 30 microJoules, or about 2% of the energy needed to register a key press on a mechanical keyboard.