How can students use the model to determine the atomic mass of the beryllium atom A- Add B and D to determine the atomic mass
B- Subtract B and A to determine the atomic mass
C-Subtract B and D to determine the atomic mass
D- Add A, B and C to determine the atomic mass

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.

if the temperature drops and becomes cool

then the atmosphere can be freezing as the water vapor in the air is at maximum (100%) and can be severely cold

also can be snowing lightly as the moisture in the air will start to solidify

and btw this is not chemistry but