psychrometerlab

Directions:
Make a small hole in the side of the plastic bottle about 3 inches from the bottom.
Twist the gauze and insert one end of it into the hole. Allow it to reach the bottom of the bottle.
Use the rubber bands to secure the thermometers to the sides of the plastic bottle.
Wrap the end of the gauze around the bottom of one of the thermometers.
Put water in the plastic bottle; allow it to reach the bottom of the hole.	It should look like this.

Now you are ready to determine the relative humidity.		It's all relative to me.
What relative would that be? Better check that out.

Use the Chart below to help you determine the relative humidity.

Dry Bulb Temperature	DRY BULB TEMPERATURE MINUS THE WET BULB TEMPERATURE, ° C
Dry Bulb Temperature	1	2	3	4	5	6	7	8	9	10
10° C	88	77	66	55	44	34	24	15	6
11° C	89	78	67	56	46	36	27	18	9
12° C	89	78	68	58	48	39	29	21	12
13° C	89	79	69	59	50	41	32	22	15	7
14° C	90	79	70	60	51	42	34	26	18	10
15° C	90	80	71	61	53	44	36	27	20	13
16° C	90	81	71	63	54	46	38	30	23	15
17° C	90	81	72	64	55	47	40	32	25	18
18° C	91	82	73	65	57	49	41	34	27	20
19° C	91	82	74	65	58	50	43	36	29	22
20° C	91	83	74	67	59	53	46	39	32	26
21° C	91	83	75	67	60	53	46	39	32	26
22° C	92	83	76	68	61	54	47	40	34	28
23° C	92	84	76	69	62	55	48	42	36	30
24° C	92	84	77	69	62	56	49	43	37	31
25° C	92	84	77	70	63	57	50	44	39	33
26° C	92	85	78	71	64	58	51	46	40	34
27° C	92	85	78	71	65	58	52	47	41	36
28° C	93	85	78	72	65	59	53	48	42	37
29° C	93	85	78	72	66	60	54	49	43	38
30° C	93	85	78	73	67	61	55	50	44	39