What is the Lightest Metal?
What is the Lightest Metal?
5 (100%) 1 vote[s]

There are a variety of metals in the world, each with its unique properties. Some are harder than others, some are more durable, and some are lighter than others. What is the lightest metal? This is a question that has been asked by many people over the years. In this article, we will discuss everything you need to know about the lightest metals!

List of the 10 Lightest Metals on Earth

Lithium (0.53 g/cm³)

Lithium is a silvery-white, highly reactive metal. It combines readily with different compounds to form new ones, but it also interacts easily and quickly due to its ability in chlorides or hydroxylswhich can lead lithium down an unstable path if not handled carefully by scientists who study these elements! The largest deposits are found within pegmatites (a type of rock containing minerals such as diamond).

Lithium is the lightest metal on our periodic table, meaning it has one of the lowest atomic weights. It’s used in several industries, including aviation and aerospace, where weight is always a concern. The metal is also used in batteries and other energy storage devices, lithium batteries can store more energy per unit of weight than any other type of battery.

Lithium (0.53 g/cm³)

Lithium has exceptional properties that make it ideal for use in many products. For instance, lithium’s melting point is higher than any other metal on Earth and its thermal conductivity makes the batteries of cars or power plants able to withstand high temperatures without fail[1].

Due to its calming effect on the nervous system, lithium is also used in some pharmaceuticals and as a treatment for bipolar disorder and other mental health conditions[2].

Potassium (0.89 g/cm³)

Potassium is the second lightest metal on Earth with a density of 0.89 g/cm³, and it can be found in many minerals, including sylvite (a crystal), carnallite (an ore), and langbeinite.

Potassium is one of the most important metals in our world. It has a wide range and variety of uses, such as fertilizers for plants[3]. The low melting point makes it perfect not just for glassmaking, but also for welding [4].

Potassium is also known for its high electrical conductivity, making it an important component in some electronic products [5]. The metal is also used in the production of some alloys and as a heat-treatment agent.

Sodium (0.97 g/cm³)

In third place, we have sodium, with a density that’s just under one gram per cubic centimeter, and it’s also highly reactive! You can find this soft silvery-white metal in many minerals like rock salt or halite (soda) too, but when you look at its elemental form all that happens is reactivity kicks into high gear – it goes boom if exposed to water ever so slightly.

The metal has a wide range of uses, the most important being in sodium-chloride (table salt). It’s also used for making glass and soap as well as dyes to color textiles such cotton clothes or wool sweaters [6]; its high electrical conductivity makes them a key component during some electronic product manufacturing processes like cell phone charges [7].

Rubidium (1.53 g/cm³)

Next on our list is rubidium, with a density that’s just over one and a half grams per cubic centimeter. It can be found in small quantities throughout many rocks or minerals.

The metal has a wide range of uses, the most important being in rubidium-based lasers. These are used in fiber optic communications and other applications. Rubidium is also used in alloys and glassmaking, as well as in atomic clocks, as it has the longest known natural radioactive decay half-life of any element [8].

Calcium (1.54 g/cm³)

Rounding out the top five is Calcium. This metal is found in a number of different minerals, including limestone, dolomite, and gypsum.

Due to its unique traits, calcium has a wide range of uses, the most important being in calcium-based alloys. These are used in many applications such as construction, automotive, and aerospace industries. Calcium is also used in glassmaking, ceramics, and metallurgy.

Calcium (1.54 g/cm³)

Calcium is an essential mineral for bones and teeth health. It also helps with blood clotting, muscle contraction, or nerve function. Calcium supplements are often taken to prevent or treat calcium deficiencies [9].

Magnesium (1.74 g/cm³)

Magnesium is one of the lightest metals, with a density of just over one and three-quarters grams per cubic centimeter. The largest deposits are usually found in dolomite or magnesite rocks.

Magnesium is a key ingredient in the production of lighter and more fuel-efficient vehicles. It can also be used for electronic products like laptops or mobile phones, construction, aerospace, and chemical manufacturing [10].

Magnesium is an essential mineral for the body. It’s involved in many important chemical reactions, including energy production and protein synthesis!

Beryllium (1.85 g/cm³)

Beryllium is a metal found mostly in minerals like bertrandite and emerald. It has unique properties that allow it to absorb X-rays, making it an important component for x-ray machines as well as for other medical equipment such as measuring devices used by doctors during surgeries or examinations of people’s bodies. Alloys containing this precious resource can also be found being used within electronics because of how highly conducting they are when compared with most metals out there today!

Beryllium exposure can be dangerous as it can lead to respiratory diseases. Therefore, care must be taken when handling this metal [11].

Cesium (1.93 g/cm³)

Cesium is an extremely light metal with the eighth-lightest density in Earth’s crust. The most commonplace cesium deposits are in pollucite or lepidolites, but this reactive element can also be found within other minerals such as rubies.

Cesium is used in different applications, the most important being in atomic clocks. Cesium is also used in television tubes, photoelectric cells, and electron microscopes. The metal is also used in certain alloys and as a getter in vacuum tubes [12].

Due to its radioactivity, cesium must be handled with care. Exposure to this metal can lead to many health problems, including cancer.

Strontium (2.64 g/cm³)

The ninth lightest metal on Earth is Strontium, which can be found in several minerals, including strontianite and Sr-rich apatite.

There are many ways to use strontium. For example: in the production of cathode-ray tubes. However, this metal has other uses, including in alloys, ceramics, and glassmaking. Strontium is also used as a getter in vacuum tubes and as a colorant in fireworks[13].

Aluminum (2.71 g/cm³)

Aluminum is a metal that’s found in nature as hydrated minerals like gibbsite and boehmite. It has many uses, but one of its most important ones is for making alloys with other metals to create materials with improved properties such as strength or resistance against corrosion-inducing environments.

The advantages of this material make it ideal for a variety of applications. One of the most unusual properties of aluminum is that it’s highly reflective [14]. That makes it ideal for use in reflectors and mirrors. More than half of all the aluminum produced each year is used in these applications. Aluminum foil is widely used in food packaging, insulation, and electrical applications. It is also used in a variety of other industries, including automotive and construction.

Lightest Elemental Metals

There are a variety of different elemental metals, but the lightest of them all is lithium. Elemental metals are those that exist in nature in their purest form, and lithium is no exception. Lithium is classified as a “light metal” because it has one of the lowest densities of any element. This means that it’s not only light in weight, but also has a very low atomic mass. When compared to other elements on the periodic table, lithium is more than twice as light!

Lightest Elemental Metals

When it comes to the lightest metal, it depends on what your definition of a “metal” is. If we are considering pure elements, then the lightest metal is lithium. But if we are considering alloys, then the lightest metal is aluminum with a density of only two and a half grams per cubic centimeter. The other lightest elemental metals are beryllium, magnesium, sodium, potassium, calcium, and strontium.

Lightest Metal Alloy

Alloys are often created to improve upon the properties of individual metals. For example, steel is an alloy that contains iron and carbon in addition to other elements such as manganese or nickel for added strength compared with either element alone.

There are many different alloys of metals, but some of the most common include aluminum, brass, bronze, copper, and steel. Each alloy has its own unique set of properties that can be advantageous in certain applications. For example, aluminum is often used in aircraft because it is lightweight yet strong. Steel is commonly used in construction because it is exceptionally strong and durable.

Usually, the lightest metal alloy is going to be some sort of aluminum. This is because aluminum alloys typically have a density of around 2700 kg/m³ [15]. However, other metals can be just as light or even lighter. One example is magnesium which has a density of only 1740 kg/m³ [16]. There are also other alloys such as titanium-aluminum and lithium-aluminum that can have densities lower than 2000 kg/m³.


What is the lightest metal in the world?

The lightest metal is lithium with a density of only 0.53 g/cm³.

Which is the lightest and heaviest metal?

The lightest metal is lithium with a density of only 0.53 g/cm³. The heaviest metal is osmium with a density of 22.59 g/cm³.

What is the lightest metal but strongest?

There is no definitive answer to this question since there are many different types of metals and alloys with different properties. Some examples of strong, lightweight metals include aluminum, titanium, and magnesium.

Is Mercury the lightest metal?

No, mercury is not a metal. It is a liquid at room temperature and has a density of 13.59 g/cm³.

What is the lightest material?

The lightest material is aerogel with a density of only 0.001 g/cm³.

Useful Video: Lithium – The Lightest Metal on Earth

Final words

So, what is the lightest metal? It turns out that there are quite a few contenders for this title, and each has unique advantages that make it perfect for certain applications. But when it comes down to it, the answer depends on how you measure “lightness”. If you consider density to be the most important factor, then aluminum takes the crown. However, if you weigh other factors such as strength-to-weight ratio or corrosion resistance, then some of the newer metals may come out on top. In any case, the field of lightweight metals is constantly evolving, even lighter metals will likely be developed, making them an increasingly important part of our lives.


  1. https://www.rsc.org/periodic-table/element/3/lithium
  2. https://www.webmd.com/bipolar-disorder/guide/bipolar-disorder-lithium
  3. https://www.frontiersin.org/articles/10.3389/fpls.2020.00904/full
  4. https://www.vynova-group.com/blog/potassium-derivatives-glass
  5. https://www.britannica.com/science/potassium
  6. https://austinpublishinggroup.com/textile-engineering/fulltext/arte-v6-id1061.pdf
  7. https://www.science.org/content/article/sodium-batteries-are-one-step-closer-saving-you-mobile-phone-fire
  8. https://www.researchgate.net/publication/235178088_The_Rubidium_Atomic_Clock_and_Basic_Research
  9. https://www.hsph.harvard.edu/nutritionsource/calcium/
  10. https://www.rsc.org/periodic-table/element/12/magnesium
  11. https://www.osha.gov/beryllium
  12. https://www.lenntech.com/periodic/elements/cs
  13. https://earthsky.org/human-world/how-do-fireworks-get-their-vibrant-colors/
  14. http://rmico.com/bare-aluminum
  15. https://www.thyssenkrupp-materials.co.uk/density-of-aluminium.html
  16. https://www.lenntech.com/periodic/elements/mg

Hello! I'm a James Miller, and I'm an expert in materials science. I learned different metal properties in the New Jersey Institute of Technology, and I know everything about all kinds of metal. That's why I want to share my experience with you.

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