1
00:00:00,560 --> 00:00:03,320
Speaker 1: Welcome to brain Stuff from how Stuff Works dot com

2
00:00:03,640 --> 00:00:07,760
Speaker 1: where smart Happens. I am Marshall Brain with today's question,

3
00:00:08,080 --> 00:00:11,959
Speaker 1: how do fog machines work? There are three common ways

4
00:00:12,000 --> 00:00:14,800
Speaker 1: to produce the fog that you often see in stage

5
00:00:14,800 --> 00:00:18,040
Speaker 1: productions and at dance clubs. You can use the fog

6
00:00:18,040 --> 00:00:21,800
Speaker 1: machine that vaporizes fog juice, or you can use dry ice,

7
00:00:22,200 --> 00:00:26,400
Speaker 1: or you can invite lots of cigarette smokers. Fog machines

8
00:00:26,440 --> 00:00:29,760
Speaker 1: and fog juice are the most common. The basic mechanism

9
00:00:29,880 --> 00:00:33,280
Speaker 1: is simple. The fog juice is heated to create smoke.

10
00:00:33,800 --> 00:00:36,240
Speaker 1: When you overheat oil on the stove and create a

11
00:00:36,280 --> 00:00:39,280
Speaker 1: lot of smoke, you're doing the same thing cooking oil

12
00:00:39,320 --> 00:00:42,280
Speaker 1: has a tendency to get gummy and smell bad. However,

13
00:00:42,760 --> 00:00:46,960
Speaker 1: fog machines use glycerin or glycol mixed with water as

14
00:00:47,040 --> 00:00:51,199
Speaker 1: their juice. According to the Seattle Times, the fog is

15
00:00:51,240 --> 00:00:56,520
Speaker 1: created using propylene glycol and triethyline glycol mixed with water.

16
00:00:57,160 --> 00:00:59,920
Speaker 1: One thing that's not clear is whether this fog has

17
00:01:00,000 --> 00:01:03,480
Speaker 1: any side effects on people's lungs. It seems like it's

18
00:01:03,480 --> 00:01:06,800
Speaker 1: a problem for asthmatics, but nothing has been proven conclusively

19
00:01:06,880 --> 00:01:10,279
Speaker 1: for the general population. If you would rather be safe

20
00:01:10,280 --> 00:01:13,360
Speaker 1: than sorry, you can use dry ice. When you place

21
00:01:13,480 --> 00:01:16,479
Speaker 1: dry ice and hot water, it creates a dense fog

22
00:01:16,600 --> 00:01:20,680
Speaker 1: that clings to the floor. This fog contains carbon dioxide

23
00:01:20,680 --> 00:01:24,280
Speaker 1: and water vapor. Do you have any ideas or suggestions

24
00:01:24,280 --> 00:01:27,240
Speaker 1: for this podcast? If so, please send me an email

25
00:01:27,240 --> 00:01:30,440
Speaker 1: at podcast at how stuff works dot com. For more

26
00:01:30,440 --> 00:01:32,680
Speaker 1: on this and thousands of other topics, go to how

27
00:01:32,720 --> 00:01:36,200
Speaker 1: stuff works dot com.