1. Qhov tseeb nyhav-thaum xa tawm, qhov nyhav ntawm cov khoom raug xa tawm raws li qhov hnyav (hnyav) hnyav;
2. Qhov ntsuas qhov nyhav-thaum lub sijhawm yug, khoom nyhav khoom yog xam raws li lub npe me me ntawm cov hlau. Tus qauv xam yog raws li hauv qab no (yog tias xa khoom raws li qhov ntsuas qhov hnyav, nws yuav tsum tau qhia hauv daim ntawv cog lus):
Kev ntsuas qhov hnyav ib 'meter' ntawm stainless hlau yeeb fittings (qhov ceev ntawm steel yog 7.85kg / dm3) cov qauv ntsuas: W=0.02466 (DS) S
Qhov twg: W - theoretical phaus ib meter ntawm stainless hlau yeeb fittings, kg / m; D - nominal sab nrauv txoj kab ntawm stainless hlau yeeb fittings, hli; S - nominal phab ntsa tuab ntawm cov yeeb nkab steel hlau fittings, hli.
