Dangers you say?
OK, let's assume it's a nice big deep pan pizza, and it weighs 500g (let's stay metric for the sake of the math).
There's a nice equation E=mc2 that we can work out how much energy that 500g needs to be created, which equates to 44,937,758,937MJ of energy. The Hiroshima atomic bomb converted approximately 700mg (or 0.7g) material (62,912,863MJ).
If the D'jini get it wrong, that's quite a big bang...
OK, Lause has asked "Could you extrapolate on how they could get it wrong and steps they could take to avoid "getting it wrong"?"
So, I'm assuming that if they get it wrong, they're just back to their own dimension, possibly with a rather large headache from the explosion (ah well, there'll be another planet with sentients somewhere nearby I'm sure).
Therefore, let's assume that they get the energy from maybe an energy differential from their dimension to ours. So, the limitation of about once a week isn't to do with re-charging, more from the mental excursion of controlling the process.
I'm thinking it's more likely they are controlling some sort of machine that does the actual process to convert the energy to mass. But they control the parameters. For each atom.
Let's go back to our large 500g pizza. If we say it's made of just Carbon12 (that's going to be most of it anyway), that's approximately 2.5 x 10^25 (25 with 24 0s after it) atoms (good old Avogadro!).
So, to create our pizza via conversion from energy to matter, we need to know:
- Where each of those 2.5 x 10^25 atoms are, in relation to each
other. Let's add not add the complication of molecules - we'll
assume put them all in the right place and the bonds between them
will happen automatically. :)
- What sort of atom each one is (otherwise, we don't get a pizza, we get charcoal)
- How much each atom is vibrating, assuming we want the pizza not to be at absolute zero temperature.
What other things to do we need to think about?
Well the D'jini have to reply on the person they are holding to actually think of just one thing while they produce the food.
So, things that can go wrong.
- As Lause mentioned, let go, the process stops. I was originally thinking it would just stop as though it never happened, but how about it stops at that point. So you get a mush of the food appearing rather than the pizza, chocolate etc.
- The D'Jin is holding my hand and I'm thinking about pizza, no chocolate, no pizza, no that weird broccoli thing my wife made that was surprising nic... no pizza! Pizza dammit! I end up with something that looks like pizza, but tastes of a mix of chocolate and broccoli...
- Let's assume there's an issue with the machine. Worst case scenario boom! Big baba boom!
The we have a series of other things that can go wrong.
Creating atoms sounds complicated to me. Forget protons and neutrons etc, we've got to start with quarks, muons and all that zoo! Best scenario, pizza disintegrates into sparkly nothingness, worst scenario, biggish bada boom!
So, we've created the right building blocks for the atoms. That's a lot of protons, neutrons and electrons in that there soup. I'm from a different dimension and we don't really have the equivalents to atoms, C12 is pretty much the same as Pu239 surely? Why are my new friends getting sick?
So, those molecules we assumed all would be OK with? Hmmm, maybe not. How much cyanide would you like in your pizza? Oh look my nice friend has just fallen over. I wonder why?
Finally we have those atoms correct, no molecule issues. What can go - aargh! AAARGH! WHY WOULD YOU CREATE PIZZA AT 250c ON MY hand! Vibrations are a funny thing, just a little bit wrong and HOW HOT!!?