It is based on the fact that after a ceramic specimen is removed from the kiln at the time of production, it immediately begins to recombine chemically with moisture from the environment.
This reaction reincorporates hydroxyl (OH) groups into the ceramic material, and is described as rehydroxylation (RHX).
Moisture expansion and weight gain are known to be proportional to each other for a specified material at any specified firing temperature.
A small piece of the ceramic is first removed, weighed, and heated to 500 °C, effectively dehydrating it completely.
According to the RHX power-law, if the weight of a fired-clay ceramic increases as a result of RHX by 0.1% in 1 yr from firing, then the weight increase is 0.2% in 16 yr, 0.3% in 81 yr and 0.4% in 256 yr (and so on).All of the Earth’s surface is divided into time zones.All places within the same time zone observe the same time.24 juuli 2017 Rein Rannapi rokk-ooperiga „Nurjatu saar“ alanud ooperipäevad lõppesid laupäeval traditsioonilise Alexela ooperigalaga, publiku hulgas viibisid nii Eesti Vabariigi president Kersti Kaljulaid kui ka peaminister Jüri Ratas. Meet thousands of single men and women from Anna for FREE. Join our site today and meet fun men and women near you looking to meet quality singles from Anna.