Which is true of the buoyant force? it acts in the upward direction. it acts with the force of gravity. it makes an object feel heavier. it acts in the downward direction.

Spontaneity tell us the direction of the reaction, but not how fast it goes. gibbs free energy brings together enthalpy, entropy and temperature in one easy formula. g = h - ts. and, finally the sign of delta g is always negative for a spontaneous reaction.