Density of air at room temperature is

120 {g c m}^{- 3}

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120 {g m m}^{- 3}

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12 {g m}^{- 3}

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1.3 {k g m}^{- 3}

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Solution

The correct option is D $1.3 {k g m}^{- 3}$
The density of air at NTP is $1.293 k g m^{- 3}$ .
So after rounding, it is $1.3 k g m^{- 3}$ .

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Q. Define thrust. What is the up thrust experienced by a balloon of volume 120

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What is the up thrust experienced by a balloon of volume 120 $m^{3}$ filled with hydrogen. The density of air = 1.140 $\frac{k g}{m^{3}}$ and density of hydrogen = 0.081 $\frac{k g}{m^{3}}$ at room temperature. What is the maximum weight this balloon can lift?

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Density of air at room temperature is

The correct option is D 1.3 kg m−3The density of air at NTP is 1.293kgm−3.So after rounding, it is 1.3kgm−3.

The correct option is D $1.3 {k g m}^{- 3}$
The density of air at NTP is $1.293 k g m^{- 3}$ .
So after rounding, it is $1.3 k g m^{- 3}$ .