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在相对湿度小于临界相对湿度的条件下，控制温度在５０～８０℃、相对湿度在５０～８０％范围内，烟酰胺在恒温恒湿下的降解速率方程为－ｄＣ／ｄｔ＝ｋ（Ｃ＿０－Ｃ）￣（－１），式中Ｃ＿０和Ｃ分别为烟酰胺的原始浓度和时间ｔ的浓度，ｋ为表观降解速率常数。ｋ与相对湿度ＲＨ的关系式为Ｉｎｋ＝ａ＋ｍ（ＲＨ），式中ａ和ｍ为常数。由Ａｒｒｈｅｎｉｕｓ公式求得相对湿度为５０．３５％、６６．８５％、７５．３３％和８０．３５％时降解的表现活化能分别为２１９．９４、１８１．８６、１６８．９９和１５３．８９ｋＪ／ｍｏｌ。烟酰胺粉末在常温下的光解速率方程为－ｄＲ／ｄｔ＝ｋ￣＇（Ｒ＿０－Ｒ）￣（－１），式中Ｒ＿０和Ｒ分别为烟酰胺的原始反射率和时间ｔ的反射率，ｋ￣＇为表现光解速率常数。
When the relative humidity is less than the critical relative humidity, the degradation rate of nicotinamide under constant temperature and constant humidity is -dC / dt = k (C_0- C -1 ¯ (-1), where C_0 and C are the initial concentration of nicotinamide and the concentration of time t, respectively, and k is the apparent rate constant of degradation. The relationship between k and relative humidity RH is Ink = a + m (RH), where a and m are constants. The calculated activation energies of degradation by Arrhenius formula at relative humidity of 50.35%, 66.85%, 75.33% and 80.35% were 219.94, 181.86, 168.99 and 153.89 kJ, respectively / Mol. Nicotinamide powder at room temperature photolysis rate equation-dR / dt = k ~ ’(R_0-R) ~ (-1), where R_0 and R were nicotinamide original reflectivity and time t reflectivity , K ~ ’for the performance of photolytic rate constant.