The weird screeching noise you hear when you put pots and pans on the stove is commonly known as "pot and pan singing" or "stove hum." This phenomenon occurs due to the way the metal of the cookware interacts with the heat source, usually the electric stove coils or gas burner.
The primary reason for the screeching noise is a phenomenon called thermal expansion. When you place a cold metal pot or pan on a hot stove, the metal quickly heats up, and its particles begin to expand. As the metal expands, it may slightly warp or bend, causing uneven contact with the stove's surface.
When the metal is unevenly heated, it can vibrate against the stove surface, creating the high-pitched screeching sound. This effect is similar to the sound produced when rubbing a wet finger on the rim of a wine glass.
Other contributing factors to the noise can include the material and thickness of the cookware, as well as any residues or debris on the bottom of the pot or pan. Sometimes, the type of stove and its design can also influence the intensity of the noise.
While the noise is generally harmless, it can be annoying. To reduce or eliminate the screeching sound, you can try the following tips:
Use flat-bottomed cookware: Ensure that the bottom of your pots and pans is flat and not warped, as this will provide better contact with the stove surface.
Center the cookware: Place the cookware precisely in the center of the stove burner to ensure even heating.
Clean the bottom of the cookware: Ensure that the bottom of your pots and pans is clean and free of debris, which could contribute to the screeching.
Adjust the flame or heat setting: Experiment with different heat settings on your stove to find the one that minimizes the noise.
Preheat the cookware: Preheating your pots and pans on low heat for a short time before increasing the heat can help reduce the noise.
Keep in mind that the screeching noise is not indicative of a safety issue with your cookware or stove. It's merely a result of the interaction between the metal, heat, and stove surface. If the noise persists or worsens despite trying these tips, you might consider using different cookware or having your stove checked for any irregularities.