What is the name of large masses of moving air caused by uneven heating between the equator and the poles

In a good thermo flask the main cause of heat loss is

The two stars in a certain binary star system move in circular orbits. the first star, alpha, has an orbital speed of 36 km/s. the second star, beta, has an orbital speed of 12 km/s. the orbital period is 137 d. a) what is the mass of the star alpha? b) what is the mass of the star beta?

Which bonds are found inside a water molecule