The tree outside my window is green . It is going to rain today ,

It smells like pizza in this room .

The dog is sad because he is wet .

The girl looks red.

Which ones is a observation and which ones is inference?

a gas, having a molecular weight of 13 kg/kmol and a kinematic viscosity of 0.25 cm2/s, flows through a pipe 0.25 m internal diameter and 5 km long at the rate of 0.4 m3/s and is delivered at atmospheric pressure.

i think its 5049.

i hope this !