He kiʻekiʻe ka ikaika o ka mea, nui ke koʻikoʻi tangential a nui ka deformation plastic i ka wā e ʻoki ai, no laila ua nui ka ʻoki ʻoki. Eia kekahi, ʻilihune loa ka conductivity thermal o ka mea, e piʻi aʻe ka mahana o ka ʻokiʻoki, a ʻo ke kiʻekiʻe kiʻekiʻe e hoʻopaʻa pinepine ʻia i ka wahi haiki a lōʻihi e kokoke ana i ka ʻoki ʻoki, a laila e hoʻolōʻihi i ka lole o ka mea ʻoki.