Pali zidutswa zingati mu tani 1 ya njerwa zaumbali?

(1) Kaya njerwa zosankhidwazo ndi zotchinga pang’ono kapena zotchinga zolemera. Njerwa zolemera zochepa zotchinjiriza zimayimira njerwa zosanjikiza zosakwana 1300Kg / m³. Njerwa zopepuka zopepuka zimakhala ndi mawonekedwe otsika, porosity, kutsika kwamatenthedwe, kuteteza kutentha, komanso mphamvu zina, kotero akhala akugwiritsidwa ntchito kwambiri pazida zothandizira kutentha. Njerwa zolemetsa zotentha kwambiri ndi njerwa zosanjikiza zomwe zimakhala ndizochuluka kwambiri kuposa 1800Kg / m³ ndipo ndizoyenera kugwiritsidwa ntchito molumikizana ndi kutentha kwambiri. Pa zinthu ziwirizi, muyenera kudziwa kaye kuchuluka kwa njerwa zomwe mwasankha.

(2) Kukula ndi mafotokozedwe a njerwa zomwe zimayenera kugulidwa amafunika kudziwa ngati njerwa zoyikirazo ndizopangidwa mwapadera kapena mitundu yodziwika ya njerwa. Kudzera mchitsanzo, kukula ndi mafotokozedwe a njerwa zotsutsa zimatha kumveka ndipo kuchuluka kwake kumatha kuwerengedwa.

(3) Malinga ndi momwe amagwiritsidwira ntchito powerengera kulemera kwake, werengani kuchuluka kwa njerwa zotsalira kuchokera pakachulukidwe kodziwika ndi kuchuluka kwa njerwa. Kulemera kwa unit = voliyumu x njira yowerengera, ndipo potsiriza mukudziwa kuchuluka kwa matani tani.