Answer:
No.2)answer
Step-by-step explanation:
As elevation increases, atmospheric pressure decreases, causing water to boil at lower temperatures, which lengthens cooking times.A pressure cooker provides constant, precise atmospheric conditions inside the cooker, reducing cooking times even at high altitudes.
No.3 Answer
When something changes its state of matter (formally, a phase change), regardless of whatever it is, it remains at it's melting point/boiling point/freezing point UNTIL all of it has changed its state of matter.
When something changes its state of matter (formally, a phase change), regardless of whatever it is, it remains at it's melting point/boiling point/freezing point UNTIL all of it has changed its state of matter.So, to clear up, ice and water can both exist at 0°C at 1 atmosphere. The difference is that water has more energy than ice does, therefore solid water can break up the bonds and become a liquid.
When something changes its state of matter (formally, a phase change), regardless of whatever it is, it remains at it's melting point/boiling point/freezing point UNTIL all of it has changed its state of matter.So, to clear up, ice and water can both exist at 0°C at 1 atmosphere. The difference is that water has more energy than ice does, therefore solid water can break up the bonds and become a liquid.I heavily suggest you take a look at calorimetry, it explains it greatly and is related to your question.