過去式：aluminized 過去分詞：aluminized 現在分詞：aluminizing
electro welded = 是兩個單字 = 電焊 electro welded steel tubing with aluminized or black paint 電焊鐵管鍍鋁或黑漆
You need to have the specific weight of the helium vs. the air. That will allow you to calculate how much helium by weight is needed to lift 0.2kg in air. Once the weight of the helium required is known, you can use the pressure [one bar] to calculate the volume of the helium in...