Question

Which of the following statement is correct when we drink the water by straw?

• A. The pressure inside the straw is equal to the atmospheric pressure.
• B. The pressure inside the straw is less than atmospheric pressure.
• C. Can't say anything about the pressure inside the straw.
• D. The pressure inside the straw is more than atmospheric pressure.

Answer 1

The correct option is B The pressure inside the straw is less than atmospheric pressure.

The liquid has a property to travel from high pressure region to low pressure region. When we suck the water by the straw, a region of low pressure is created inside the straw and outside the straw becomes high pressure region. So the liquid starts flowing from glass to straw.