<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>14051247</termId><termName>conceptos físicos</termName><termType>PT</termType><termCreatedDate>2026-03-30 20:20:30</termCreatedDate><relation><relationType>BT</relationType><termId>14050102</termId><termName>conceptos de ciencias físicas</termName><termType>PT</termType></relation><relation><relationType>NT</relationType><termId>14055652</termId><termName>[energía y conceptos relacionados]</termName><termType>PT</termType></relation><relation><relationType>NT</relationType><termId>14055653</termId><termName>presión</termName><termType>PT</termType></relation><relation><relationType>NT</relationType><termId>14055654</termId><termName>conceptos acústicos</termName><termType>PT</termType></relation><relation><relationType>NT</relationType><termId>14055655</termId><termName>conceptos mecánicos</termName><termType>PT</termType></relation><relation><relationType>NT</relationType><termId>14055656</termId><termName>tiempo</termName><termType>PT</termType></relation><relation><relationType>NT</relationType><termId>14055657</termId><termName>conceptos ópticos</termName><termType>PT</termType></relation><relation><relationType>RT</relationType><termId>14084815</termId><termName>física</termName><termType>PT</termType></relation></term>  </Zthes>