Videoth

The abbreviation th carries two very different meanings depending on whether you are in a science lab or checking your calendar. In chemistry, it is the symbol for thorium, a radioactive metallic element used in nuclear reactors. In daily life, it is the standard shorthand for Thursday, the fifth day of the week. This lesson explores how to identify these meanings through context and provides examples of how the term appears in scientific texts and personal schedules. You will also learn about the specific properties of thorium and the proper way to pronounce these terms in speech. Watch this lesson to master the dual roles of this common abbreviation.

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A scientist carefully handles a sample of thorium in a laboratory.