Show slight error found in in fahrenheit thermometer fahrenheit who made the first mer cury glass thermometer arbitrarily assumed that the amount bof f expansion of f mercury was exactly proportional to the increase of temperature the error of this assumption was learned was found that the rates of 0 elpa expansion n sion of different liquids were not strictly prop proportional proportion 1 to each other and therefore not proportional to the temperature pera ture calculations hare bare shown show writes dr thomas M beck in ID the chicago tribune that temperature Is exactly proportional to the pressure of an ideal gas that Is a gas molecules possess neith r weight nor volume unfortunately an a ii gas exists only as a theo c cal 11 concept however certain gases hydrogen and helium sp ap enach the lie ideal in behavior and by rip duplication of small corrections can be wade made to give thil the same results as an ideal gas consee jerily the corrected hydrogen thermometer Is the standard on which all thermometers are based and Is used for the most precise temperature measurements the hydrogen thermometer Is rather cumbersome so for everyday purposes the mercury thermometer Is I 1 used obviously it cannot be used below the freezing point of mercury 10 40 degrees for such temperatures thermometers mo meters filled with alco alcohol fiol oi or pentane a low boiling gasoline are used for above the boiling doida of mercury about degrees another liquid metal gallium has found application and above the softening temperature of glass about 1200 degrees the thermometer tube Is made of quartz |