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Weight
W = mass * gravity
1 N = 1 ?
1 N = 1 kg-m/s²
Force
Force = Mass x Acceleration
Force if friction is considered
Force = (Mass x Acceleration) + (Friction Constant x Weight) = (Mass x Acceleration) + (Friction Constant x Mass x Gravity)
Weight Density, γ
γ = weight / volume = density x gravity
Specific Gravity of Gas
SG = γ of gas / γ of water
Mass Density
p = mass / volume
Specific Gravity of Gas
SG_gas = Density of Gas / Density of Water