(seperated by commas)

Could we have dirt? Something like powder, except it doesn't burn and is heavier.

Suggest the addition of hinges

y not

oo and mud for plants to grow

Perhaps an element that reacts to ice?
Could be used for timers and the like, to alert you? Not to stray too far off-topic but I created a Stickman Game a while ago that uses an ice timer and I feel it would be a good idea for some sort of reaction to take place to time being up. I also read that one of the new, Thermite, reacts with Ice in real life, causing a minor explosion and the ice's change from ice directly to steam. It would give the current thermite a bit more use!

Also, I suggest an element that changes colour to stimuli, if this is possible?
Something like, under warm temperature changes to an orange colour, tepid temperature to a green colour and cold temperatures to a light blue? I've had this idea for quite a time and I think this could be an extension to a current element; maybe TCMT/TCML "Thermochromic Metal", TCWR "Thermochromic Wire", TCGL/TCGS "Thermochromic Glass" or TCGL/TCGW "Thermochromic Glow". In fact, instead of Thermochromic Glow, this could be added to the original Glow, to give it some more use. How does this sound?

And finally, perhaps some temperature-related batteries?
Two elements, PTCB and NTCB, standing for Positive Temperature Coefficient Battery and Negative Temperature Coefficient Battery. These will basically be Batteries with relative resistance; PTCB will constantly give off sparks under low temperatures but its resistance increases slowly as temperatures increase until it stops releasing sparks. Same but with reversed temperatures for NTCB.
This could be great for controlled sparking speed. Say, you have PTCB linked to some metal or thermistor, which is placed above one jet of steam and one jet of fire, each of which can be controlled with some switch. Currently the PTCB is releasing sparks at its optimum speed, but switch on the steam to slow down spark release for your circuit or game. And for even slower speeds, use the fire.

Personally, this kind of thing would help in the Space Invaders imitation I was planning
But it can also be used in all kinds of situations where spark release speed matters alot and might open the scope for new creations?

Whaddaya think, people?

About color change depends on temperature - this should be in PT.

And one thing... maybe liquid that grows like Yeast as it gets hotter and is getting smaller and smaller as cooled.


Yea thermometres and more!

^ half-agreed. Shrinking yeast isn't of any use apart from possibly in something extremely complex and specific

You can get a thermometer by placing a sign on the spot from which you want the temperature and entering "{t}" into the typing field.
The sign now shows the temperature! Same for pressure, but with {p}.