Many people use the terms scales and balances interchangeably, creating a bit of confusion. In this article, we examine the key distinctions between these two pieces of equipment and their ideal use cases. Keep reading to discover the differences between balance vs scale.
While both are, in essence, weighing machines, did you know they are not quite the same?
Understanding the technical differences between balance vs. scale is essential to find a weighing solution that works best for your purpose.
The most significant difference between a scale and a balance is that while the former measures the weight of an object, the latter measures the mass. In other words, a scale measures the force of gravity on an object; a balance measures the amount of matter present.
Differentiating between the two ensures accurate measurements and appropriate application in respective contexts.
In this article, let’s examine the key distinctions between these two pieces of equipment and their ideal use cases.
We will also see which might be the best for your application.
What is the main difference between a weighing scale and a balance?
While it is true that both weighing balance and a scale measure similar things, there are critical differences between them; both instruments operate on different principles and have distinct applications.
A weighing scale operates based on the principle of tension or compression.
Modern electronic weighing scales measure weight using a load cell that generates an electronic signal proportional to the applied weight. The weight is then displayed on a digital or analog readout.
On the other hand, a balance operates on the principle of moment balance.
In its simplest form, a weighing balance consists of a beam and a pivot, with pans of equal weight suspended from each end. When two objects of equal mass are placed on each pan, the beam remains horizontal.
Furthermore, the scale measures the weight of an object against a built-in reference, often calibrated against standard weights.
On the contrary, a balance compares the weight of an unknown object against a known weight or reference. The object’s unknown mass is determined based on the known mass.
So, as you can imagine, these differences make scales and balances quite different in principle and application.
Keep Reading: How to use a triple beam balance.
Understanding weighing scales
Let’s talk about the weighing scale and its different types. When you place an object on a scale, the load cells in it sense the force exerted by the object and convert it into an electric signal.
This signal is then processed and displayed as a weight reading. Depending on the design, weighing scales can use mechanical, spring-loaded, or electronic mechanisms to gauge and represent weight accurately.
Types of weighing scales
Several types of scales available in the market differ in the internal mechanism of how they operate.
Here are some of the most common ones you can buy:
Spring or mechanical scales
These utilize a spring mechanism. The weight on the platform causes the spring to compress or extend, and a pointer indicates the weight on a calibrated scale.
While such scales are simple to use and durable, they are less accurate than their digital counterparts.
Digital or electronic weighing scales
These use electronic load cells to convert force into an electrical signal displayed digitally. They are commonly found in homes, kitchens, and many commercial settings.
They tend to be more sensitive, but their capacity is limited.
If you are looking for a precise and sensitive electronic scale, check out the Ohaus Explorer EX224 with a readability of 0.0001 grams.
Balance beam scales
Predominantly found in medical facilities, they consist of a beam with sliding weights, which, when balanced, give a reading of the weight.
Platform scales
Designed for heavy loads, these have a large platform and are often found in warehouses or industrial settings.
Scales are also often classified based on their use, such as kitchen, postal, and bathroom scales.
Understanding weighing Balance vs Scale
Typically, these instruments are found in labs and research facilities and operate on moment balance. Balances use a beam with pans on either end. When equilibrated, the unknown mass equals the reference mass.
Weighing balances, especially in laboratory settings, are designed to measure mass precisely.
Types of balances
Various balances have been developed depending on the accuracy required and the specific application.
Here is an overview of some commonly used weighing balances:
Beam balance