# 含水量本文重定向自 Water content

Soil composition by Volume and Mass, by phase: air, water, void (pores filled with water or air), soil, and total.

## 定义

${\displaystyle \theta ={\frac {V_{w}}{V_{\text{wet}}}}}$

${\displaystyle u={\frac {m_{w}}{m}}}$

${\displaystyle u'={\frac {m_{w}}{m_{\text{wet}}}}}$

${\displaystyle u''={\frac {m_{w}}{m_{\text{dry}}}}}$

${\displaystyle \theta =u\times SG}$.

### 导出量

${\displaystyle S_{w}={\frac {V_{w}}{V_{v}}}={\frac {V_{w}}{V\phi }}={\frac {\theta }{\phi }}}$

${\displaystyle \Theta ={\frac {\theta -\theta _{r}}{\theta _{s}-\theta _{r}}}}$

## 测量

### 直接测量

${\displaystyle V_{w}={\frac {m_{w}}{\rho _{w}}}={\frac {m_{\text{wet}}-m_{\text{dry}}}{\rho _{w}}}}$

${\displaystyle m_{\text{wet}}}$${\displaystyle m_{\text{dry}}}$是样品烘干前后的质量；
${\displaystyle \rho _{w}}$是水的密度；

${\displaystyle u'={\frac {m_{\text{wet}}-m_{\text{dry}}}{m_{\text{wet}}}}}$

${\displaystyle u''={\frac {m_{\text{wet}}-m_{\text{dry}}}{m_{\text{dry}}}}}$

### 实验方法

${\displaystyle p={\frac {W-D}{D}}}$

(J/kg 或 kPa)

(vol/vol)

θa ≡ θfc − θpwp