When we suck using a straw, the liquid travels up into it. Explain why?

Hint:The force applied perpendicular to an object's surface per unit area across which that force is spread is known as pressure. Pressure is measured in a variety of ways. Some of them are derived from a force unit split by an area unit; the SI unit of pressure, the pascal (Pa), is one newton per square metre.

Complete answer:
The term "suction" refers to the difference in air pressure between two places. A pressure differential occurs when air is removed from a space. As a result, external air pressure limits suction pressure. With greater pressure than is available in the surrounding environment, even a perfect vacuum cannot sucke.

When one portion of a system's pressure is dropped compared to another, the fluid in the higher pressure region exerts a force on the lower pressure region. Pressure reduction can be static, as in a piston and cylinder configuration, or dynamic, as in a vacuum cleaner with a lower pressure area caused by air movement.

We generate a pressure differential at the two ends of the straw when we suck with it. This causes the liquid to rise through the straw. Liquid moves from a high pressure to a low pressure environment. As a result of the upward low pressure, liquid rises in the straw. When you inhale through the straw, less air presses on the water within than on the water outside. As a result of the imbalance, more water is forced into the straw. The water will rise until the air pressure differential matches the pressure generated by the water column in the straw.

Note: The air pressure inside the straw must be lower than the external atmospheric pressure if the water is to be raised. This results in a reduced counterforce, allowing the water to be pushed higher by the force of the external ambient pressure. Sucking at the drinking straw's aperture causes the air particles inside to be drawn out, decreasing the internal air pressure. A negative pressure is created inside the straw as a result of this. The higher external ambient pressure pushes the water upwards against the lower pressure within the drinking straw in this way.