To reduce wear, moving surfaces should be separated by what type of substance?

Moving surfaces experience wear due to friction, which can cause material degradation and heat generation. To mitigate this wear and ensure smoother operation, lubricants are essential. Lubricants form a thin film between the moving parts, reducing direct contact and minimizing friction. This separation not only decreases wear on the surfaces but also helps in heat dissipation and can prevent corrosion. The use of a lubricant, like oil or grease, is critical in mechanical systems where moving parts are present, as it significantly enhances the lifespan and efficiency of the equipment.

On the other hand, friction is generally the cause of wear, not a means to reduce it. Sealers may help protect parts from contaminants, while adhesives are meant to bond surfaces together rather than separate them. Hence, a lubricant is the most appropriate substance for reducing wear between moving surfaces.