Ko te tātai mō te tātai taumaha pōkai maitai ko: Taumaha (kg)=Whānui (mm) × Matotoru (mm) × Roa (m) × Kiato (g/cm³) × 0.001. Hei tauira, mo te maitai waro noa (kiato 7.85 g/cm³), ki te 1000 mm te whanui o te porowhita, 1 mm te matotoru, me te 200 m te roa, ko te taumaha=1000 × 1 × 200 × 7.85 × 0.001=1570 kg.
Tuhipoka: 1. Me whakatika nga uara kiato i runga i te papanga (hei tauira, he kowiri tira he 7.93 g/cm³);
2. Ka tatauhia te roa i runga i te diameter o waho o te porowhita ma te whakamahi i te tauira e whai ake nei: Te roa (m)=(Diameter o waho² - Diameter roto²) × 0.7854 ÷ Te Matotoru (mm) ÷ 1000;
3. Ka whakaaetia e te ahumahi he ± 5% te taumaha. I tenei wa ka tukuna e matou nga taonga horoi whakarewa i roto i nga toa. Ka whakamahi enei hua i te -tatai wai kaha e tika ana mo te-whakamaomatanga peita, a, e waatea ana i roto i nga paera 25 kg mo te mahi ahumahi.
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