weigh的名词英语（Measuring Weight An Overview of Different Weighing Terminologies）
Measuring Weight: An Overview of Different Weighing Terminologies
As an essential measurement, weighing is used in different fields such as science, medicine, engineering, and commerce. From measuring ingredients in cooking to determining the weight of a plane, scales and balances play a crucial role. However, before delving into specific measuring devices, it is essential to understand the terminologies used in weighing. Here's an overview of different terms used in measuring weight.
Mass vs. Weight
Mass and weight are two concepts that are often interchanged but have different meanings. Mass is the amount of matter that an object has and is measured in kilograms (kg) or grams (g). On the other hand, weight is the force exerted by the mass under the influence of gravity and is measured in Newtons (N) or pounds (lbs).
Therefore, while mass remains constant regardless of location, weight varies depending on the location's gravity force. For instance, an object weighing 10 kg on Earth will weigh less on the moon due to its lower gravity.
Accuracy vs. Precision
Accuracy and precision terms describe a device's ability to measure correctly and consistently. However, they have different meanings. Accuracy refers to how close the measured value is to the actual value, while precision measures how consistent the results are.
For instance, if a balance is accurate, it will provide readings that are close to the expected value, while if it is precise, it will have measurements that are consistent with little variation.
Types of Weighing Scales
There are different types of scales used in measuring weight. Some common types include:
Balance Scales:
This type of scale works by balancing the object being weighed and the standard weight or counterweight. The device measures the weight by weighing the sample against the weight reference. Balance scales are commonly used in chemistry labs and precious metal shops, where accurate measurements are essential.
Spring Scales:
Spring scales, also known as force gauges, use the principle of Hooke's law, which states that the force needed to extend a spring is proportional to the distance stretched. The spring in the device is calibrated to produce a weight at certain extensions. This type of scale is often used in fishing, where fishermen use the device to weigh the catch.
Electronic Scales:
Electronic scales use an electronic circuit to convert measurements into digital values. They feature digital displays, which make them easy to read and interpret the measurements. They are commonly used in stores to measure the weight of goods sold or in kitchens for measuring cooking ingredients.
In conclusion, understanding different weighing terminologies is crucial in obtaining accurate results. The choice of weighing scale depends on the application and the level of accuracy required. Whether measuring the weight of ingredients, luggage, or aircraft, choosing the right measuring device is essential in obtaining consistent and reliable results.