Throwing boiling water on someone would 100% meet the standard for a deadly weapon in Texas.
Everything is a deadly weapon | Texas District & County Attorneys Association
By Benjamin I. Kaminar Assistant County & District Attorney in Lamar County There is a long-running thread on the TDCAA user forums entitled “A Frog is a Deadly Weapon.”[1] Over the years…www.tdcaa.com
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Agreed:
(3) "Deadly force" means force that is intended or known by the actor to cause, or in the manner of its use or intended use is capable of causing, death or serious bodily injury.