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Broken home thermometer - type identification based on a photo

bobqu 16113 11
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Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
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  • #1 19471462
    bobqu
    Level 2  
    Hi,
    I broke the thermometer today... I have no idea when it was bought and I’m not sure if it is mercury-based. I collected what I could, but some of it fell through the cracks. I’m sending a photo. As far as I know, mercury does not wet glass, but I wanted to ask you for advice.

    Broken home thermometer - type identification based on a photo

    Thanks for the help!
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  • Helpful post
    #2 19471466
    750kV
    Level 33  
    You can see that it`s gal. Mercury does not stick to glass and as a very heavy liquid (at room temperature) it immediately flows down.
  • #3 19471656
    bobqu
    Level 2  
    Thanks for your reply! Now I will sleep soundly!
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  • #4 19471738
    viayner
    Level 43  
    Hello,
    Gallium can be spread on the glass surface, but mercury cannot; at room temperature, gallium is a solid and mercury is liquid. Will you sleep soundly because gallium is biologically neutral?
    Regards
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  • #5 19471836
    bobqu
    Level 2  
    viayner wrote:
    Hello,
    Will you sleep soundly because gallium is biologically neutral?


    Is this a question or a statement? :) As far as I know, gallium is non-toxic.
  • Helpful post
    #6 19472031
    viayner
    Level 43  
    Hello,
    what I really wanted was that it is a non-toxic metal but not completely neutral, as always, unnecessary contact should be avoided.
    Regards
  • #7 19472094
    bobqu
    Level 2  
    Bright! I removed as much as I could. The most important thing is that there are no fumes that could be harmful to health. Thanks!
  • #8 19472162
    kortyleski
    Level 43  
    Damn, I`m completely paranoid about this mercury. For these "fumes" to be harmful to you, you would have to spill a bucket of it in a ventilated room.
  • #9 19472175
    palmus
    Level 34  
    A long time ago, when a thermometer broke, every child had fun playing with balls. And even when they are old, they remember it to this day. Now, the fire brigade is called for a broken thermometer.
    I wonder where this comes from...
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  • #10 19472409
    viayner
    Level 43  
    Hello,
    palmus wrote:
    ...I wonder where this comes from...

    maybe due to people`s greater awareness of the harmfulness of the world around us.
    Soon this discussion may turn into something like: when I was a child, I rode in a large Fiat without seat belts and there was nothing wrong with me, and now they tell me to wear seat belts...
    Regards
  • #11 19472425
    avatar
    Level 36  
    Well, trivializing the threat of mercury vapor is a weak topic. See how mercury evaporates at room temperature - there are cool videos on YT from a special camera/setup.
  • #12 19472460
    palmus
    Level 34  
    The harmfulness of the world, yes. But also falling into paranoia. E.g. deadly dangerous eternit on the roof, often covered with moss.
    After all, it is dangerous when inhaled. And in order to breathe it, these boards must be subjected to some kind of mechanical processing, and dry.
    It`s obvious that mercury evaporates. But how much of it does it take to inhale to achieve undesirable effects?
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Topic summary

✨ The discussion revolves around the identification of a broken thermometer, with the user uncertain if it is mercury-based. Responses clarify that the liquid observed is likely gallium, as mercury does not adhere to glass and is a liquid at room temperature, while gallium can spread on glass and is solid at that temperature. Concerns about the toxicity of gallium and mercury are addressed, with reassurance that mercury vapor is not a significant health risk unless in large quantities. The conversation also touches on societal changes regarding safety awareness and the historical context of mercury use in thermometers.
Generated by the language model.

FAQ

TL;DR: Galinstan melts at −19 °C and "readily wets glass"—if your spill smears and sticks to glass, it’s likely mercury‑free. This FAQ helps homeowners identify broken‑thermometer fluid and clean up safely. [“Galinstan”]

Why it matters: Quick identification guides safe cleanup and reduces exposure risk for you and your family.

Quick Facts

  • Mercury is liquid at room temp (mp −38.83 °C) and beads up without wetting glass. [“Mercury (element)”]
  • Galinstan (Ga‑In‑Sn) used in mercury‑free thermometers melts near −19 °C and readily wets glass. [“Galinstan”]
  • Gallium melts at 29.76 °C, so it’s usually solid indoors; molten gallium also wets glass. [“Gallium”]
  • A fever thermometer typically contains about 0.5–3 g of mercury when present. [“WHO: Mercury and health”]
  • EPA cleanup guidance: ventilate, pick up with stiff paper and tape, and never vacuum or sweep. [“Mercury Spills (EPA)”]

How can I tell from appearance if it’s mercury or a gallium-based alloy?

Look for wetting on glass. Galinstan “readily wets glass,” leaving a smeared, adherent film rather than round beads. It stays liquid at room temperature because its melting point is about −19 °C. These visual cues strongly indicate a mercury‑free gallium‑based alloy. [“Galinstan”]

Does mercury stick to glass or bead up?

Mercury has very high surface tension. It forms shiny, mobile beads and does not wet or stick to clean glass. Beads coalesce and roll, especially on smooth, sloped surfaces. This behavior is a key visual identifier for elemental mercury. [“Mercury (element)”]

Is galinstan (or gallium) toxic if I touched it?

Galinstan is designed as a mercury substitute and is considered non‑toxic. Wash skin with soap and water after contact. Avoid ingestion and keep it away from aluminum surfaces. It can leave gray stains due to surface wetting and oxide formation. “Non‑toxic” does not mean risk‑free, so minimize unnecessary contact. [“Galinstan”]

What should I do immediately after a suspected mercury spill?

Do this:
  1. Ventilate: open windows and close interior doors; leave the area for 10–15 minutes.
  2. Collect: use stiff paper or cardboard to gather beads; use sticky tape for tiny droplets.
  3. Contain: seal debris in an airtight jar or zip bag; label for hazardous waste. Never use a vacuum. [“Mercury Spills (EPA)”]

Are mercury vapors dangerous at room temperature?

Yes. Elemental mercury slowly evaporates at room temperature, and about 80% of inhaled vapor is absorbed in the lungs. Small indoor spills can raise air levels, especially in poorly ventilated spaces and cracks. Limit exposure by prompt, proper cleanup and ventilation. [“ATSDR ToxFAQs: Mercury”]

Some liquid fell into floor cracks—what now?

Treat cracks as contaminated if mercury is possible. Ventilate, gently nudge beads together with paper, and use sticky tape to lift residues. Seal all cleanup material in airtight containers. Do not vacuum. Contact local environmental or hazardous‑waste services for disposal advice. [“Mercury Spills (EPA)”]

Is gallium solid at room temperature?

Yes. Gallium’s melting point is 29.76 °C, so it is usually solid indoors. It can melt in a warm hand or hot room. When molten, it wets glass and many surfaces, which can make spills look smeared rather than beaded. [“Gallium”]

Do modern glass thermometers use galinstan instead of mercury?

Many mercury‑free clinical thermometers use Galinstan, a gallium‑indium‑tin alloy. It is non‑toxic, remains liquid well below room temperature, and readily wets glass. These properties make it a practical mercury replacement in capillary thermometers. [“Galinstan”]

Can I vacuum or sweep a mercury spill?

No. “Never use a vacuum” because it disperses mercury into tiny droplets and increases vapor release. Sweeping also breaks droplets into smaller beads that are harder to recover. Use stiff paper, eyedroppers, and tape per spill guidance instead. [“Mercury Spills (EPA)”]

How do I dispose of the broken thermometer and cleanup waste?

Seal glass, beads, and cleanup materials in an airtight container or zip bag. Label it clearly. Take it to a household hazardous‑waste facility or follow local authority instructions. Do not place mercury wastes in regular trash or drains. [“Mercury Spills (EPA)”]

Could the broken thermometer be alcohol-based instead of metal?

Yes. Alcohol thermometers use dyed liquids (often red or blue) and contain no silvery metal droplets. If you see colored liquid without metallic shine or beads, it is likely an alcohol thermometer, which does not release mercury vapor. [“Alcohol thermometer”]

Can gallium-based alloys damage aluminum or electronics?

Yes. Galinstan and liquid gallium can corrode and embrittle aluminum and some other metals. Keep these alloys away from aluminum housings, heatsinks, and foils during cleanup and storage. Use glass or compatible plastics for containers. [“Galinstan”]

When should I call professionals or local authorities?

Call if mercury spreads over a wide area, enters porous materials or HVAC, or if you cannot collect all beads. Also call for spills larger than a thermometer’s contents, or when vulnerable people are present. Follow local health or environmental agency guidance. [“Mercury Spills (EPA)”]
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