Swimming at the 2011 World Aquatics Championships – Women's 50 metre butterfly explained

Event:	Women's 50 metre butterfly
Competition:	2011 World Aquatics Championships
Dates:	July 29, 2011 (heats and semifinals) July 30, 2011 (final)
Competitors:	52
Nations:	47
Win Value:	25.71
Gold:	Inge Dekker
Goldnoc:	NED
Silver:	Therese Alshammar
Silvernoc:	SWE
Bronze:	Mélanie Henique
Bronzenoc:	FRA
Prev:	2009
Next:	2013

The women's 50 metre butterfly competition of the swimming events at the 2011 World Aquatics Championships was held on July 29 with the heats and the semifinals and July 30 with the final.

Records

Prior to the competition, the existing world and championship records were as follows.

51 swimmers participated in 7 heats.^[1]

Rank	Heat	Lane	Time	Notes
1	7	4	25.68	Q
2	7	5	25.88	Q
3	7	7	25.98	Q
4	6	6	26.16	Q
5	5	4	26.17	Q
6	6	2	26.20	Q
7	6	4	26.32	Q
8	5	3	26.37	Q
9	6	3	26.37	Q
10	5	6	26.43	Q
11	7	6	26.43	Q
12	7	3	26.50	Q
13	5	5	26.59	Q
14	5	7	26.60	Q
15	7	1	26.69	Q
16	6	7	26.83	Q
17	6	8	26.86
18	4	3	26.87
19	6	1	26.98
20	5	2	27.01
21	7	8	27.01
22	7	2	27.03
23	5	1	27.15
24	6	5	27.24
25	5	8	27.27
26	4	4	27.38
27	4	5	27.53
28	4	6	27.61
29	3	5	27.62
30	4	1	27.75
31	4	8	27.82
32	3	4	27.91
33	3	3	27.92
34	4	7	27.98
35	3	2	29.16
36	3	6	29.37
37	3	1	29.67
38	3	7	30.50
39	1	6	30.69
40	2	3	30.81
41	2	4	31.12
42	3	8	31.15
43	2	5	31.56
44	2	2	32.27
45	2	6	32.68
46	2	7	33.48
47	2	8	34.06
48	2	1	34.59
49	1	4	36.87
50	1	5	38.37
51	1	3	55.17
-	4	2		DNS

The semifinals were held at 18:19.^[2]

Rank	Lane	Time	Notes
1	4	25.52	Q
2	6	25.78	Q
3	3	25.90	Q
4	2	26.07	Q, =NR
5	1	26.12	Q
6	5	26.32	Q
7	7	26.34
8	8	26.74

The final was held at 18:02.^[3]