Chemical weapons were used extensively in World War 1 to injure and kill entrenched soldiers. Early in the war, tear gas was used by both sides but proved limited in its lethality. By 1915, more lethal gases like phosgene were being produced and used in large quantities by Germany, France, and Britain. The most widely used and effective gas was mustard gas, introduced by Germany in 1917. Mustard gas caused large, painful blisters upon contact with skin and could linger in low-lying areas for days after being deployed.

1. WEAPONS IN WW1
Carolina Techev, Aida Olvera

2. CHEMICAL WEAPONS
 Chemical weapons were used to injure and kill entrenched
defenders. The killing capacity of gas was limited-only 4% of combat
deaths were caused by gas.

4. TYPE OF GASES
 1914> Tear Gas: The French army was the first to employ gas, using 26
mm grenades filled with tear gas.
 1915> Lethal Gas: Germany fired 18,000 artillery shells containing
liquid xylyl bromide tear gas on Russian positions on the Rawka River
during the batlle of Bolimov in January of 1915. Around 36,600 tons of
phosgene were manufactured: Germany-18,100 tons; France-15,700 tons;
Great Britain-1,400 tons.
 1917>Mustard Gas: Most widely reported and most effective gas.
Introduced by Germany in July of 1917 prior to the Third Battle of Tpres.

6. MUSTARD GAS
 As it acts on any exposed, moist skin. Once coming in contact
with skin, it produces large burn-like blisters. And worse, it can nastily
hand about in low areas for hours, even days, after being dispersed.
Pure sulfur mustard is colorless.

9.  Molecular Formula: C4H8CL2S
 OTHER GASES:
 Senfgas
 Yperite
 thiobis(chloroethane)
 Iprit
 Schwefel-lost