Equilibrium of temperature. The water is trying to reach the same temperature as the environment it sits in. a cup of hot water has a higher temperature than the room so therefore begins to cool. a cup of cold water has a lower temperature than the room and therefore begins to heat up. both reach equilibrium when at the same temperature as the room
because you are allowing more of it to be exposed to water. it is called heat transfer. while the oxygen is much cooler than the cup itself, it will cool the cup. this happens without stirring, but with stirring, you are increasing the "surface area" (the parts that are at the bottom are being exposed) which speeds up the process. give me trust point? (:
metal cup because it has insulation
the warmth from the hot water will go to the cool water and it will make both waters cool
The water evaporates and the warm water vapour condensed on the cooler surface of the cup, hence the water droplets is formed.
It will stay cooler or hotter depending on what it originally was.
Plastic is the better insulator. So in a warm room, the plastic cup will prevent cold water from warming up as quickly as water in a metal cup. Provided its not one of those thermos mugs.
The cold lemonade cool the temperature of the plastic cup including the outer side of it. Thereby lowering the amount of water the air can contain, resulting in water condensating - attaching to the cup.
If the water in the cup came from the kettle, it will be cooler than the water that remains in the kettle. Since the water in the cup is more exposed to the air than the kettle it will lose heat to evaporation more quickly than the water in the kettle will. The cup will also conduct heat way from the water until the water and the cup are the same temperature, whereas the kettle is already as hot as the water it contains.
the water molecules are getting cold
I think black, because black attract heat or light.White, because black attracts heat.and white is stupider. The water in the black cup will cool faster. A dull black surface generally is a better emitter and absorber of radiation compared to a shiny smooth surface of cup 2. This increases the amount of heat lost via radiation in the black cup to be greater, causing water in the white cup to be of higher temperature.
hot bioilling water
If the mug is made of glass, it will allow the water to cool faster. A thick styrofoam cup is better than a paper cup, even though the insulating properties of the materials are similar.
A good cup of tea is made with boiling water (212 F). If you don't let it cool it will burn your mouth.
the paper cup cannot become appreciably hotter than the water it contains
The best way to cool drinks without a fridge is to place the cup inside a porous clay pot standing in a pool of cold water. By allowing a breeze to blow over the pot the water is converted into water vapour and cools the inside of the pot.
Like most cooked foods, they can spoil over a period of time and can become safe to eat. Just wipe off the fungus with with a cool water and a heaping cup of bleach.
yes you dumábss
Warm it and add yogurt or some cream about half a cup with some water.
The sand is most likely to heat up faster, particularly if it is dark. The water will have some evaporation, which will keep it cooler. It can also vary by how it is subjected to the sun's heat, like a flat pan or a colored cup, or clear vessel.
Impossible to say without knowing three things: the kind of container it's in, the ambient air temperature, and the starting temperature of the water. A cup of boiling water in a sealed thermos that someone put in an oven heated to 100 degrees will take far longer to cool to 78 degrees F (in fact, it never will cool to 78 degrees; it can't get any colder than the ambient air temp, which is 100 degrees) than a cup of 80-degree water in an aluminum canteen cup you stuck in the freezer.
Polystrene is more insulated than a glass beaker and than a polystrene cup keepsm hot water hotter for longer than a glass beaker
Because it transfers its heat to the tap water making it cold.The best way to cool drinks without a fridge is to place the cup inside a porous clay pot standing in a pool of cold water. By allowing a breeze to blow over the pot the water is converted into water vapour and cools the inside of the pot.
Put teabag in cup, boil kettle, let water cool for a bit, then pour it in.