# Thick Smoke Dissipation **URL:** \ **Category:** Public\ **Created:** [March 1, 2012, 12:52pm UTC](https://forums.chaos.com/t/thick-smoke-dissipation/40559 "2012-03-01T12:52:30Z")\ **Posts on this page:** 1\ **Showing post:** 35
**Author:** ![Sascha\_Selent](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/sascha_selent/32/4796_2.png) [@Sascha\_Selent](https://forums.chaos.com/u/Sascha_Selent)\ **Post date:** [August 7, 2012, 12:05pm UTC](https://forums.chaos.com/t/thick-smoke-dissipation/40559/35 "2012-08-07T12:05:57Z")
Discharge > [@Element AA problem](https://forums.chaos.com/t/element-aa-problem/38996/3): > > the discharge is measured in scene units per second, for big scale scenes you need bigger discharge in order to achieve the same effect. Can you please explain this more? The documentation says “The speed (not the quantity) of the discharged fluid. The quantity of the fluid will be equal to this parameter multiplied by the object’s surface.” So I have system unit scale 1 Unit = 0,1 inch - that means my object emits with 400 inches per second - but what means the surface multiplier? And isn´t 400 inches per second still very much? In a default scene (1 unit = 1 inch) a PHXSource starts with discharge 40. I have 100 times more if I calculate right… In my scene I do 2 diffenrent simulations: the biiig smoke simulator with discharge 4000 and a small hires simulator for the fire with discharge 400 (which fits the default of 40 with my scene units set to 1 unit = 0,1 inches). If I use a small discharge to get a nice fire I do not get enough smoke to fill the scene unless I crank up the smoke multiplier - which produces some weird dense smoke that is really hard to shade. So what would be the right way to achieve this: a nice small fire on the cooking place burning on and on producing THAT MUCH smoke that the whole building will be filled up? Do I have to crank up the discharge or better the smoke multiplier? Or do I have to try to achieve this with the transparency in the simple smoke? Or is it a mixture of all? Thank you again. **Sascha** btw.: What do you think about my smoke? --- _[View the full topic](https://forums.chaos.com/t/thick-smoke-dissipation/40559)._