A room that is 500 cm x 400 cm x 250 cm contains 65 kg of air. Determine the volume of air in the room and its density.

1.3g/L is the density of the air

Explanation:

The room is full of air, the space that the air occupy is:

500 cm x 400 cm x 250 cm = 5.00x10⁷ cm³

The density of a substance is defined as the ratio between the mass of the substance and the space that occupy. We can express the density of air in g/L:

Grams air:

65 kg  * (1000g / 1kg) = 65000g

Liters:

5.00x10⁷ cm³ * (1L / 1000cm³) = 50000L

Density:

65000g / 50000L =

b) mutualism

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indicate valleys, hills, steepness and gentleness of slopes.

explanation:

contour lines on a map indicate elevation, or depth. numeric notations on contour lines refer to the level of elevation, or height about sea level.