while measuring the boiling point of water using laboratory thermometer the bulb should not touch the surface of the beaker.why?
Answers
Answer:
True or false T =True F=False
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1.veins are located deep inside the body
2.the human heart has 4 chambers
3.the valves between the upper and lower of the heart can open both ways
4.The aorta is the largest artery in the body
5.O2 poor blood is made O2 rich in the lungs
6.yoga is a simple exercise that can learnt from anyone
pls answers these questions
Answer:
A pot of boiling water is actually slightly higher than the boiling point. I know, that doesn't make sense. Let me explain. The boiling point is defined as the temperature at which the vapour pressure is exactly equal to the external pressure. The “Normal Boiling Point” is the boiling point at exactly 1 atm of pressure. If you look closely at a pot of boiling water you'll notice bubbles rising from the bottom of the pot. Those bubbles are pure water vapour and since they have pushed back the water that is on top of themselves and the air over the water, they must have had a pressure greater than the external pressure to do that. Those bubbles will stop expanding when the pressure just exactly equals the boiling point and will stay there as they finish rising in the pot. Thus, the steam just above the water will be a better measure of the boiling point because it will not yet have had a chance to cool down.
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