Question 1

Why do my pans warp on the hob?

Accepted Answer

Because metal expands when heated, and if one part of the pan expands faster than another, the resulting internal stress bends it. The technical term is **thermal shock** when it happens suddenly.

**The main causes:**

**Rapid temperature change.** Adding cold water to a hot pan, or putting a hot pan under a cold tap, cools the inner surface instantly while the outer metal is still hot. The two try to be different sizes simultaneously and the base deforms. This is the single most common cause and the easiest to avoid.

**Heating an empty pan.** Food and liquid absorb heat and spread it. An empty pan on high heat reaches extreme temperatures very unevenly.

**A burner much smaller than the pan.** Concentrated heat in the centre with cool edges creates a strong temperature gradient across the base — the classic cause of a base that bulges downward and then rocks.

**High heat on a thin base.** Thin metal has little thermal mass and cannot spread heat sideways fast enough.

**Why some pans resist it better.** **Thickness** matters most, since a thick base conducts heat sideways and evens out gradients. **Multi-ply construction**, with aluminium or copper bonded between stainless layers, spreads heat well — but **dissimilar metals expand at different rates**, so poorly bonded cheap clad pans can delaminate or warp precisely because of that mismatch. **Cast iron** is thick and slow to change temperature, making it resistant, though it can crack under severe thermal shock.

**Why warping matters:** on induction and ceramic hobs a warped base loses contact with the surface, cooking unevenly and, on induction, sometimes failing to couple at all. Pans that spin or rock are the visible symptom.

**Prevention:** heat gradually, match pan to burner size, never heat empty, and let pans cool before washing.

Question 2

Why do induction hobs need special pans?

Accepted Answer

Because an induction hob does not produce heat at all — the pan is the heating element, and only certain metals can perform that role. How it works. Beneath the glass surface is a coil of wire

Question 3

Why does my non-stick pan stop being non-stick?

Accepted Answer

Because the coating is a thin polymer layer bonded to metal, and everyday kitchen use degrades it in several ways at once. A non-stick pan is a consumable, not a permanent item, and understanding

Question 4

Why do oven door glass panels sometimes shatter?

Accepted Answer

Because oven doors use toughened (tempered) glass, and the property that makes it safe is the same property that makes it fail spectacularly rather than gradually. How toughened glass is made. The

Question 5

Why does my oven cook unevenly?

Accepted Answer

Nearly every oven has hot and cool areas, and the size of the difference is what separates normal from faulty. Before assuming a fault, it is worth establishing how far off it actually is. An

Question 6

Why is my food burning on the outside but raw in the middle?

Accepted Answer

Because heat is arriving at the surface faster than it can conduct into the centre. Cooking is limited by conduction, and conduction through food is slow — so the fix is almost always lower heat for

Question 7

What should never go in a dishwasher?

Accepted Answer

Dishwashers combine high temperature, prolonged wetting, and strongly alkaline detergent. Each damages particular materials, and the alkalinity is the part people underestimate. Cast iron and carbon

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