1 mmwg = 9.81 Pa 1Kwatt = 1000 watt my problem is put the conversion units written above & get the formula from watt = Pa * m3/s to watt = mmwg*m3/s/102 pl. do confirm

The Formula is {P(pa) X M3/sec} / 1000 =KWatt

Now You have measured the pressure in mmwg, So convert it to Pascal That is mmwg X 9.81

So, The formula becumes  {P(mmwg) X 9.81 X m3/sec } /1000 = Kwatt

I.e   {P(mmwg) X m3/s X (9.81/1000)} = Kwatt

i.e {P(mmwg) X m3/s X .00981} = Kwatt

i.e {P(mmwg) X m3/s /102} = Kwatt

OK  DEAR

no dear it is not like that just see 1mmwg = 9.81 Pa so Pa = mmwg/9.81 now put this value in the formula Pa * m3/s/1000 mmwg*m3/s divided by ( 1000*9.81) now tell me what is the mistake