take the code here:
--------------------------------
tpt.el.wax.name="SODM"
tpt.el.wax.color=0xCBCBCB
tpt.el.wax.description="Sodium"
tpt.el.mwax.name="LSDM"
tpt.el.mwax.color=0xA9A9A9
tpt.el.mwax.description="Liquid Sodium"
math.randomseed(os.time())
function sodium(i,x,y,s,n)
if tpt.parts[i].life==0 then
tpt.parts[i].life=8
end
ox=math.random(x-1,x+1)
oy=math.random(y-1,y+1)
if tpt.get_property("type",ox,oy)==tpt.el.watr.id or tpt.get_property("type",ox,oy)==tpt.el.dstw.id or tpt.get_property("type",ox,oy)==tpt.el.sltw.id then
tpt.set_property("type",tpt.el.hygn.id,ox,oy)
tpt.set_property("temp",tpt.get_property("temp",ox,oy)+100,ox,oy)
tpt.create(math.random(x-1,x+1),math.random(y-1,y+1),tpt.el.caus.id)
tpt.parts[i].life=tpt.parts[i].life-1
end
if tpt.get_property("type",ox,oy)==tpt.el.wtrv.id then
tpt.delete(i)
tpt.create(x,y,tpt.el.fire.id)
end
if tpt.parts[i].life==1 then
tpt.delete(i)
end
end
tpt.element_func(sodium, tpt.el.wax.id,1)
tpt.element_func(sodium, tpt.el.mwax.id,1)
function amon(i,x,y,s,n)
for ex=x-1,x+1,1 do
for ey=y-1,y+1,1 do
if tpt.get_property("type",ex,ey)==tpt.el.acid.id then
tpt.delete(ex,ey)
tpt.parts[i].life=tpt.parts[i].life-1
if tpt.parts[i].life==51 then
tpt.delete(i)
end
end
end
end
end
tpt.element_func(amon, tpt.el.caus.id,1)

-----------------------------------
that's all,it can react with water,and it's perfect for timebombs.