Where does this come from, and can I check it?

Mercury and bromine are the sole elemental substances that melt below twenty degrees. The figure is taken from Encyclopaedia Britannica, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.

Is this really a science fact?

Yes. It sits on the Science shelf, one of 1,090 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.

What else can I read about it?

The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.

Mondo Knows Facts

Only two elements are liquid at room temperature

Mercury and bromine are the sole elemental substances that melt below twenty degrees

Out of 118 known elements on the periodic table, only mercury and bromine exist as liquids at standard room temperature and pressure. Mercury is a dense metallic liquid maintained by relativistic electron effects, whereas bromine is a dark red non-metallic halogen. Elements like gallium and caesium melt just slightly above room temperature.

Where this comes from

Encyclopaedia Britannica

Facts that can change over time are reviewed and updated. If something here looks wrong, Mondo would rather know than be confidently incorrect.

Go further

Science trivia Density Calculator

More facts like this

Mercury experiences extreme surface temperature swingsWithout a thick atmosphere Mercury swings from scorching days to freezing nights Ultraviolet light creates ozone in the upper atmosphereHigh energy solar radiation splits oxygen gas into reactive free atomic oxygen Hydrogen makes up three quarters of all cosmic massAs the simplest chemical element hydrogen dominates stellar composition across space Chemical reactions either release or absorb thermal energyExothermic changes release heat while endothermic processes absorb energy from surroundings Aerogel is a solid synthetic material that is mostly airReplacing liquid in a gel with gas creates ultra-light solids up to 99 percent air Graphene is a single atom layer of extraordinary strengthCarbon atoms bonded in a two-dimensional honeycomb sheet are two hundred times stronger than steel

Tags: chemistry, mercury, bromine

Only two elements are liquid at room temperature: the short answers

Where does this come from, and can I check it?: Mercury and bromine are the sole elemental substances that melt below twenty degrees. The figure is taken from Encyclopaedia Britannica, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.
Is this really a science fact?: Yes. It sits on the Science shelf, one of 1,090 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.
What else can I read about it?: The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.