I was doing asphalt core Gmb using archimedes principle for volume calculation i find that when i submerge the core in water after 5mints the balance give the stable submerge wieght..but when i spin the core forcely in water the wieght increased by 4 to 5 gram..why this happened..in ASTM standered you cannot forcely rotate the core in water..whats its logic..help
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