When hot water freezes before cold

Unorthodox bubbles when boiling in cold water.

High-speed movies are taken when bubbles grow at gold surfaces heated spotwise with a near-infrared laser beam heating water below the boiling point (60-70 °C) with heating powers spanning the range from very low to so high that water fails to rewet the surface after bubbles detach. Roughly half the bubbles are conventional: They grow symmetrically through evaporation until buoyancy lifts them ...

Hot or cold? The basics of tempered water.

When You're Hot, You're Hot! Warm-Cold Effects in First Impressions of Persons and Teaching Effectiveness

We examined the effects of Kelley's "warm/cold" manipulation on first impressions of persons and teaching ability. A stimulus person, posing as a visiting professor, gave a "neutral" lecture to 240 university students. Before the stimulus person appeared, half of the subjects received information that he was a rather warm person, whereas the other half was told that he was a rather cold person....

Cold and hot.

Hot & Cold Working

Q.1. What is hot working ? State its principles, advantages and disadvantages. Ans. Mechanical working of metals above its recrystallisation temperature is known as hot working. Advantages : 1. Larger deformation can be accomplished and more rapidly by hot working since the metal is in plastic state. 2. Porosity of the metal is considerably minimised. 3. Concentrated impurities, if any in the m...