μm Là Gì? Cách Tính Và ứng Dụng Của đơn Vị μm Trong đời Sống



We are all familiar with units of measurement such as kg, dm, cm, meters, km, mm, but the unit μm might be unfamiliar to many. So, what exactly is the unit μm and how is it used in everyday life? In this article, we will provide you with useful information about this unit.

What is μm?

μm is the abbreviation for micrometre; it represents a distance equal to one millionth of a meter (10-6m). In the International System of Units (the most widely used system in science, economics, trade, education, technology in countries around the world), micrometre is a derived unit from the base unit meter according to its definition.


The symbol for micro is µ; it is prefixed to units in the International System of Units, indicating that the unit is divided by one million.


How to Calculate μm: 1 Micrometre in mm, cm, m, inch?

Calculating micrometres in other units is very simple. You just need to divide by 1000. For example:

  • 1 micron = 1/1,000,000 m
  • 1 micron = 1/1,000 mm
  • 1 micron = 1/10,000 cm
  • 1 micron = 1/25,400 inch

Why Use μm?

In the process of studying, researching, doing business, education, transactions, or trading, there are objects with sizes too small to be measured in millimeters or meters. Objects or products smaller than 0.1mm are difficult to measure and imagine. That’s why the unit μm is used to make it easier to visualize.


If we use the metric system, expressing the length as exponents or powers can be very difficult to understand. Using the unit micron is much more convenient and understandable. For example, when referring to a 1 micron filtering fabric or core, it means that particles with a size of 0.001mm can pass through. Particles larger than 0.001mm will be trapped.

Applications of μm

Micrometres are commonly used to measure particle size in physics. They are also used to measure filtration products such as PP fabric, nylon fabric, non-woven PE fabric, stainless steel mesh, as well as water filter bags, liquid filter bags, water filter cores, and liquid filter cores.

For filtration cores such as cotton cores, wound fiber cores, PE cores, and PP cores with filtration levels finer than 0.2 microns, 0.5 microns, it means that particles smaller than 0.0002mm can pass through, while particles measuring 0.0002mm will be retained.

With the information we have gathered, we have answered the question “What is μm?” and helped readers understand how to calculate this unit. We have also provided insights into the applications of micrometres in daily life. If you have any further questions, please leave a comment below to receive the fastest response.

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