日冕的电离气体（又叫等离子体）不仅非常炙热，而且异常稀薄，其密度还不到组成太阳主体的氢气密度的十亿分之一。
As well as being very hot, the ionised gas of the corona (called plasma) has a superthin consistency. It is less than a billionth of the density of the hydrogen that makes up the main ball of the Sun.
考虑等离子体中存在电离和复合这两种互逆过程及扩散和压力不均匀引起的等离子体流动，建立密度动力学方程。
A dynamic equation of plasma density is constructed about ionization, recombination, diffusion and plasma flow which is produced by inhomogeneous pressure.
水中放电等离子体(PPDW)具有高压、高密度和低温、低电离度的特点，人们对其辐射是否具有黑体辐射的特点一直观点不一。
Plasma in a pulsed discharge in water (PPDW) has the character of high pressure, high density and low temperature, low ionized degree.
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