# Dry matter

Determination of the dry matter of a starting material (here: chopped maize ) for energy generation in a biogas plant

The dry mass or dry matter (DM) is that part of a substance that is left of the water contained after deducting the crowd: ${\ displaystyle m_ {T}}$

{\ displaystyle {\ begin {alignedat} {2} & m_ {T} && = m _ {\ mathrm {ges}} -m_ {W} \\\ Leftrightarrow \, & m_ {T} + m_ {W} && = m_ { \ mathrm {ges}} \ end {alignedat}}}

Are in it

• ${\ displaystyle m_ {T}}$ the mass of dry matter
• ${\ displaystyle m _ {\ mathrm {ges}}}$ the total mass of the sample
• ${\ displaystyle m_ {W}}$ the mass of the water.

In relation to the total mass results:

${\ displaystyle \ Leftrightarrow TS + W = 1 = 100 \, \%}$

d. H. Dry matter content and water content complement each other 100 percent, with

• ${\ displaystyle TS = {\ frac {m_ {T}} {m _ {\ mathrm {ges}}}} = {\ frac {m_ {T}} {m _ {\ mathrm {ges}}}} \ cdot 100 \ , \%}$( Mass fraction of dry matter = dry matter)
• ${\ displaystyle W = {\ frac {m_ {W}} {m _ {\ mathrm {total}}}} = {\ frac {m_ {W}} {m _ {\ mathrm {total}}}} \ cdot 100 \ , \%}$(Mass fraction of the water = water content ).

The dry matter content is used in different areas: