it becomes warm
Hot water causes the jar lid to expand.
When you poor water into a jar full of marbles, the water will fill the spaces between the marbles; bubbles will also appear.
run lid over hot water and open with a cloth over lid.
The hot water will make the cap expand (it gets slightly bigger/looser). If the jam has already been opened it may also dissolve any sugar that may be causing the lid to stick.
What's in the jar? If you mean water, the ice *should* extrude out of the jar a little way without bursting it.
it sinks
The jar can not handle the temperature and compression so it cracks.
Yes, water vapor can form outside of a hot water jar. When the hot water inside the jar heats the air around it, the air can hold more moisture. As this hot and moisture-laden air comes into contact with cooler surfaces outside the jar, such as the jar itself or the surrounding air, condensation occurs and water droplets can form.
A hypothesis for which freezes the fastest between cold and hot water could be that hot water freezes faster than cold water. This phenomenon, known as the Mpemba effect, has been observed under specific conditions where hot water cools faster than cold water due to factors such as evaporation and convection currents. This hypothesis would need to be tested through controlled experiments to draw a conclusion.
Hot water causes the jar lid to expand.
Using hot water to open a metal jar lid helps to expand the metal, making it easier to twist open the jar. The heat from the hot water causes the metal to expand while the glass of the jar remains relatively unaffected, creating a temperature difference that helps to loosen the lid.
You can make hot cinnamon toothpicks using boiling water instead of soaking in a jar by using regulated heat.
When you poor water into a jar full of marbles, the water will fill the spaces between the marbles; bubbles will also appear.
To make fog without dry ice and a fog machines, first fill a jar with hot water and then pour most of it out into a bowl. Place a strainer over the jar and then add ice to the strainer. The fog should begin to form inside the jar due to condensation.
Cover it with a thick lid.
when the jar has boiling water, the air above is hot and less dense therefore there is a lower amount of air molecules then out side the jar. When you put the lid on the hot air inside cools, the previously hot air condenses and creates a vacuum of lower pressure, making it harder to unscrew the lid
Running a glass jar lid under hot water can cause it to expand due to the heat and potentially become easier to open if it was previously stuck. However, sudden changes in temperature can also cause glass to crack or break, so caution should be exercised.