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4.2 kg
200-400 kg
1 tonne = 1000 kg. 0.2 tonne = 0.2*1000 = 200 kg.
capillary number(Ca)=(viscosity*velocity)/surface tension viscosity have the unit (kg/(meter*time)) same for velocity(meter/time) and surface tension ((kg*meter)/(time2*meter)) so= (kg *meter*time*time*meter)/(meter*time*time*kg*meter) = unitless dimension={M0 L0 T0}
The weight of standard air is 1.2256 Kg/ Cubic Meter The weight of hydrogen is 0.0857 Kg/ Cubic Meter The weight of helium is 0.1691 Kg/ Cubic Meter Subtracting the weight of hydrogen from air gives you the gross buoyant lift of hydrogen as 1.1399 Kg/Cubic Meter Subtracting the weight of helium from air gives you the gross buoyant lift of helium as 1.0565 Kg/Cubic Meter These values are variable under altitude, pressure, temperature, humidity and purity of gas. Hope this helps you.