watch glass

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Explanation of "Watch Glass"

Definition: A "watch glass" is a piece of glass that can have two main uses:

Usage Instructions:

1. In Watches:

   • When talking about a watch, you might say: "Make sure the watch glass is clean so you can see the time clearly."

2. In Laboratories:

   • In a lab, you might use it like this: "Place the watch glass over the beaker to prevent evaporation."

Example Sentences:

• Watchmaking Context: "The watch glass on my new watch is made from scratch-resistant sapphire."
• Laboratory Context: "We used a watch glass to cover the beaker while heating the solution."

Advanced Usage:

• In scientific discussions, a watch glass might be mentioned when discussing evaporation rates or when performing experiments that require covering containers to avoid contamination or loss of volatile compounds.

Word Variants:

• Watch: This can refer to the device that tells time or can mean to look at something carefully.
• Glass: Can refer to any material that is transparent, typically used for making windows or containers.

Different Meanings:

• Watch:

  • As a noun: A device for telling time.
  • As a verb: To look at something attentively.

• Glass:

  • As a noun: A material made from silica, used to make windows and containers.
  • As a verb: To cover or fit with glass.

Synonyms:

• For watch glass (in watches):

  • Crystal (in watch terminology)

• For watch glass (in laboratories):

  • Petri dish (for similar uses in science, but is usually deeper)
  • Cover slip (though this is thinner and used for slides in microscopy)

Idioms and Phrasal Verbs:

There are no specific idioms or phrasal verbs directly related to "watch glass," but you might encounter phrases like:

Academic

Noun

1. a protective cover that protects the face of a watch
2. laboratory glassware; a shallow glass dish used as an evaporating surface or to cover a beaker

Synonyms

• crystal
• watch crystal