وَاللَّمْسُ وَهِيَ قُوَّةٌ مُنْبَثَّةٌ فِي جَمِيعِ الْبَدَنِ
Touch is described as a faculty distributed throughout the body.
The text lists heat, cold, moisture and dryness and related tangible qualities. Contact often yields sensations of warmth, coldness, softness, hardness or roughness.
Feeling a metal surface as cold is a direct tactile experience. Establishing its measured temperature and explaining the physics of heat transfer require further investigation.
The apprehension of a quality must not be equated with full knowledge of its physical cause.