Cold is fizzier
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Cold soda is fizzier than hot soda because lower temperatures help gases, like carbon dioxide, dissolve better in liquids. When soda is cold, more carbon dioxide can be trapped within the liquid, resulting in more bubbles and a fizzier sensation when opened and poured.
When you conduct the hot soda can in cold water experiment, the sudden change in temperature causes the air inside the can to cool and contract, creating a lower pressure inside the can. This lower pressure causes the can to be crushed or implode due to the higher pressure of the surrounding atmosphere pushing on the can.
The process of water droplets condensing on a soda can on a hot summer day is exothermic. As water vapor in the air comes into contact with the cold surface of the soda can, it releases heat energy, causing the water vapor to condense into liquid water droplets.
When the soda can is placed in the refrigerator, it absorbs the cold temperature of the surrounding air and cools down. This causes the can to feel cold to the touch when you take it out of the refrigerator.
When you take a soda out of the fridge, it absorbs the heat from its surroundings, including the moisture in the air. This heat absorption, along with the cold temperature of the fridge, can make the soda feel cold to the touch even though its actual temperature may not have changed significantly.
A thermos keeps hot drinks hot and cold drinks cold by using a vacuum layer between two walls of the container. This vacuum layer prevents heat transfer by conduction, convection, and radiation. The result is that hot drinks stay hot because heat loss is minimized, and cold drinks stay cold because heat gain is minimized.