Why might the helium balloon float while the other rests on the table?

Explanation:

Helium balloons work by the same law of buoyancy. The helium balloon displaces an amount of air (just like the empty bottle displaces an amount of water). As long as the helium plus the balloon is lighter than the air it displaces, the balloon will float in the air. It turns out that helium is a lot lighter than air.

Might the helium balloon float while the other rests on the table? Helium has less mass in the same amount of space than air does so the helium sinks in the air Helium has less mass in the same amount of space the air does, so the helium balloon floats in

Explanation:

answer: semi-infinite solid initially at a uniform temperature of 400 ◦c is cooled at its surface by convection. the cooling fluid at a constant temperature of 200 ◦c has a convective coefficient (ha) of 250 w/m2.k. the physical properties of the solid: k = 20 w/m.k and α = 4 * 10-5  m2/s. using δx = 0.04 m and δt = 10 s. write the finite difference equations describing the transient heat transfer of the first five δx and the temperature profile after 30 s.