Approximately 79% of the atmosphere is oxygen, with the other 21% being nitrogen.
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Q2: A boiler is an open vessel in
Q3: Safety hazards associated with boilers and other
Q4: Pressure is the force exerted against an
Q4: Pressure is the force exerted against an
Q5: Which of the following is not an
Q6: The least effective preventive measure for overcoming
Q8: Which of the following situations may cause
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Q10: Boyle's law states that the product of
Q12: Atmospheric pressure is usually measured using a:
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