# What is the buoyant force exerted on the balloon in air

#### Eng67

Is this a correct interpretation of Archimedes Principle for this application?

A balloon is filled with helium (density = .02 kg/m^3) and has a volume of .009 m^3. What is the buoyant force exerted on the balloon in air
(density = 1.3 km/m^3)?

Fb = (1.3 km/m^3)x (.009 m^3) x (9.80 m)

= .115 N

Thanks

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#### Doc Al

Mentor
Yes. Archimedes' Principle says that the buoyant force on an object equals the weight of the displaced fluid.

#### SGT

Nitpick! Mass is measured in kg, not km. The latter is a measure of distance.

#### gunblaze

Ya.. Eng67, u'r units are all wrong
Unit for density: $$kg/m^3$$
Unit for gravity: $$m/s^2$$

#### Eng67

Thanks for the help Guys. I just typed in Km instead of Kg.

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