Pouring hot coffee into a cold glass risks shattering due to thermal shock, creating stress from uneven temperature changes. While tempered or borosilicate glass can handle temperature extremes, most everyday glassware cannot. Suggested methods include cooling the coffee or using sturdier vessels, but Martha Stewart offers a simple solution: placing a metal spoon in the glass. The spoon conducts and disperses heat, allowing the glass to warm gradually and minimizing the risk of cracking.
Placing a metal spoon in a glass before adding hot coffee helps to conduct and disperse the heat, preventing rapid temperature changes that cause glass to crack.
The temperature shock from pouring hot coffee into a cold glass can cause the glass to shatter due to stress from uneven expansion and contraction.
Using tempered or borosilicate glass avoids the risk of thermal shock, but most everyday glassware is not made for such temperature changes.
Martha Stewart suggests using a metal spoon to absorb some heat from hot coffee, allowing the glass to warm more gradually and safely.
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