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What else can I help you with?
How do you heat a thermos?
Fill the thermos with hot water and let it sit for a few minutes to warm up the interior. After that, pour out the hot water and immediately fill the thermos with your desired hot liquid, such as soup or coffee. This will help to keep your beverage hotter for longer.
Did you see the demonstration of water in a closed flask boiling when cooled?
Yes. I saw it, and I was able to reproduce it in my kitchen. I didn't have a flask, so I used a glass bottle with a screw-on cap. After the water in the bottle was boiled, then removed from the heat and the bottle plunged into ice, the bottle, of course, soon disintegrated, but not before the water inside it had clearly and distinctly resumed its boiling.
What is the best way to keep a thermos hot or cool?
To keep a thermos hot, pre-heat the thermos with boiling water before adding the hot liquid. For cold beverages, pre-chill the thermos with cold water or ice cubes. Keep the lid tightly closed to maintain the temperature inside.
Must a flask be a good conductor of heat?
No, a flask does not necessarily have to be a good conductor of heat. In fact, many flasks are designed with insulating materials to help maintain the temperature of the liquid inside, whether hot or cold. So, a flask can be effective at keeping beverages hot or cold without being a good conductor of heat.
What happens to the level of the water in the straw when the water in the bottle is cooled?
When the water in the bottle is cooled, it contracts and creates a lower pressure inside the bottle. The higher atmospheric pressure outside the bottle pushes the water up through the straw to equalize the pressure, causing the water level in the straw to rise.
Why was it necessary to match the water levels inside and outside the cooled flask before removing it from the water bath?
So to equalize the pressure inside the flask with that of the atmosphere.
Is a thermos flask also good for keeping water cold for several hours?
Yes. The thermos flask can reduce the amount of heat travelling from the surroundings to the cold water
What do you call the object that keeps water hot for hours?
Thermos flask or vacuum flask.
Can a thermos flask keep cold water cold?
Yes, a thermos flask can keep cold water cold for several hours due to its insulated design that helps to maintain the temperature of the liquid inside. It is more effective at keeping beverages hot, but it can also help to preserve the cold temperature of water for a decent amount of time.
Why did the water rush into the erlenmeyer flask when it was submerged in the cold water?
1. When the flask was placed into the cold water, the colder air molecules in the flask move slower, putting out less pressure. With the decrease in air pressure inside the flask, the now greater pressure outside pushes water into the flask until the pressure inside equals the pressure outside.
What keeps water colder aluminum water bottles or stainless steel water bottles?
Vacuum insulated stainless steel bottles like one from Hydro Flask [see related link "hydro flask" below] or Thermos [see related link "thermos" below] will keep them coldest.
What happens if a cold substance kept in thermos flask?
It heats up and the water keeps warm for a certain amount of time
What is the thermo flask?
Thermos flask is a thermos container used to store liquids like any hot drink. The liquid added to thermos flask will retain the temperature even after some time irrespective of external temperatures.
When the water level is higher inside than outside the flask is the gas pressure in the flask higher than lower than or the same as the atmospheric pressure?
When the water level is higher inside than outside the flask, the gas pressure in the flask is lower than the atmospheric pressure. This is because the weight of the column of water inside the flask creates an additional pressure on the gas inside, reducing its pressure relative to the atmospheric pressure outside.
When the water level is higher inside than outside the flask is the gas pressure in the flask higher or lower or the same as the atmospheric pressure?
When the water level is higher inside the flask than outside, the gas pressure in the flask would be lower than the atmospheric pressure. This is because the water exerts a partial vacuum on the gas in the flask, reducing its pressure compared to the external atmospheric pressure.
Will a thermos keep cold or hot water at it's temperature range longer?
The rate of heat flow across a boundary such as the vacuum between the inside of the thermos flask and the ambient atmosphere is proportional to the temperature difference. So if you have hot water inside at say 90 C and an ambient of 30 C that is a difference of 60 C, whilst if you have cold water inside at 10 C the difference is 20 C. The heat flow will therefore be three times as much for the hot water as for the cold water, so the rate of change of temperature will be three times greater.
What change in the water level occurs when you hold Erlenmeyer flask over a candle in a pan of water?
When you hold an Erlenmeyer flask over a candle in a pan of water, the water inside the flask heats up and expands, causing the water level in the flask to rise. This is due to the expansion of the water molecules as they gain thermal energy from the heat source.
