Question

select the correct answer.
a photograph shows emma drinking water from a glass using a straw.
emma drinks water from a glass using a straw. which of these best describes how the fluid moves from the drinking glass to emma’s mouth?
a. emma creates a pressure difference allowing the fluid to flow.

b. emma creates a temperature difference allowing the fluid to flow.

c. emma creates a change in the state of the fluid using the straw.

d. emma creates wind which gives kinetic energy to the fluid.

Explanation:

When using a straw to drink, a person sucks air out of the straw, lowering the pressure inside the straw. The atmospheric pressure pushing up on the water in the glass is higher than the pressure inside the straw, creating a pressure difference that forces the water up the straw and into the mouth. The other options are incorrect: temperature difference, state change of the fluid, and wind are not involved in this process.

Answer:

A. Emma creates a pressure difference allowing the fluid to flow.