Question

Why is it necessary to check a liquid measurement at eye level?

1) To ensure accurate measurement
2) To make the liquid level easy to see
3) To prevent spills
4) To avoid eye strain while measuring

Answer 1

It is necessary to check a liquid measurement at eye level to provide an accurate measurement, which ensures standardized readings and reduces errors. This is done by reading the meniscus at its lowest point from directly in front.

Step-by-step explanation:

To ensure accurate measurement when checking a liquid measurement, it is essential to view the level of the liquid at eye level. This practice helps in correctly reading the volume of liquid in a vessel such as a graduated cylinder. The meniscus, or the curved surface of the liquid, has to be read at its lowest point. Not only does this method provide a standardized way for measurement across different contexts, but it also significantly reduces the potential for measurement errors that can arise from viewing the liquid level from above or below. This careful approach is crucial in scientific experiments where precision is necessary for valid results and comparability across different laboratories.

An example to further illustrate this point would be measuring the volume of water in a graduated cylinder. You would fill the cylinder with water, ensuring that it has a round cross-section and smooth, vertical sides. After placing the cylinder on a level surface, you would then stoop down so that your eye is level with the liquid's surface. By doing this, you can subdivide the distance between the milliliter marks into tenths and make an accurate reading at the bottom of the meniscus. This procedure is akin to ensuring a gas pump delivers a standardized gallon, as indicated by the red and white labels certifying its accuracy.

Answer 2

Checking a liquid measurement at eye level is primarily necessary to ensure accurate measurement and make the liquid level easy to see. It allows for a precise assessment of the liquid's volume, minimizing errors in measurement.

The correct option is 1.

Step-by-step explanation:

1.Accurate Measurement: Viewing the liquid at eye level helps in obtaining an accurate measurement by aligning the meniscus (the curve at the liquid's surface) precisely with the measurement mark. This method minimizes parallax errors, ensuring the correct volume is measured.

2.Easy Visibility: Checking at eye level provides optimal visibility of the liquid's level against the measurement markings on the container. This clarity aids in obtaining a precise measurement without confusion or misinterpretation.

While preventing spills and avoiding eye strain are valid concerns, they are not directly related to the necessity of checking liquid measurements at eye level. The primary purpose is to ensure accuracy and clear visibility when measuring liquids.

So, the correct option is 1) To ensure accurate measurement.