Flammable materials in the air will absorb the moisture in the air. To determine the effects of moisture, cotton fabrics were selected as experimental materials for our investigation. A series of experiments was conducted on conditioned cotton fabric samples with different widths (40, 60, 80, 100, 120 mm) and different moisture regain (0%, 2%, 4%, 6%, 8%, 10%, 12%, 14%, 16%, 18%). The surface temperature profile, flame height, and flame spread rate were observed and analyzed. It was found that with the increase of moisture regain, the pyrolysis zone of the sample became smaller monotonically. For the flame height and flame spread rate, the moisture brought a positive effect and a negative effect to them, resulting in a trend that keep stable first and then decrease. Moreover, the decrease rates of flame spread rate were greater for the wider samples, which were 0.81, 1.00, 1.27, 1.67, and 1.86 mm/s², respectively for 40, 60, 80, 100, and 120 mm wide samples.

空气中的易燃材料会吸收空气中的水分。为了确定水分的影响，我们选择棉织物作为实验材料。对具有不同宽度（40、60、80、100、120毫米）和不同回潮率（0％，2％，4％，6％，8％，10％，12）的条件棉织物样品进行了一系列实验％，14％，16％，18％）。观察并分析了表面温度分布，火焰高度和火焰扩散速率。发现随着回潮的增加，样品的热解区单调变小。对于火焰高度和火焰蔓延速率，水分给它们带来了积极的影响和消极的影响，从而导致了趋势，先保持稳定，然后下降。此外，^2个，分别用于40、60、80、100和120 mm宽的样品。