Do boats get lighter when out of the water?

Yes, boats can appear to be lighter when out of the water due to the absence of buoyant forces acting on them. When a boat is in water, it displaces a volume of water equal to its weight, which provides buoyancy. Once removed from the water, this buoyancy effect is lost, and the boat's weight is solely supported by the ground or trailer it rests on. However, the actual mass of the boat remains unchanged; it's just the buoyant force that is no longer acting on it.