Final answer:
The salt in a shaker is in the solid phase, which is one of the three recognized phases of matter in Chemistry, alongside liquid and gas.
Step-by-step explanation:
Chemistry recognizes three fundamental phases of matter: solid, liquid, and gas. The salt in a shaker is in the solid phase, meaning its constituent particles are in contact and held in place. Unlike the liquid phase, where particles move with respect to each other, or the gas phase, where particles are separated by relatively large distances, solid-phase particles maintain a fixed volume and shape. Therefore, the salt in your shaker at room temperature is in a single phase - the solid state.