Random facts

Conversions

72.8 GiB weighs the same as 1 C-12 atom

Colors

Noise distribution XYZ xy
brown 1.0411,1,0.6317 0.3895,0.3741
pink 1.0144,1,0.7868 0.3621,0.3570
white (definition) 1,1,1 ⅓,⅓
white (calculated) 0.9957,1,0.9776 0.3349,0.3363
blue 0.9867,1,1.2113 0.3085,0.3127
violet 0.9893,1,1.4966 0.2838,0.2869

HTTP 1.1 standard

RFCs

Registries

Common bandwidths (accounting for coding overhead)

Bandwidth (bps) Medium
14.4 k GSM data
56 k dial-up modem
92.16 k RS-232 serial port
1.228 M CD-ROM 1×
1.536 M USB 1.0 low speed
11.08 M DVD-ROM 1×
12 M USB 1.0 full speed
54 M 802.11a/g
88.5 M CD-ROM 72×
100 M Fast Ethernet
144.4 M 802.11n 2×2 20 MHz (2.4 GHz)
256.92 M DVD-ROM 24×
280 M USB 2.0 high speed
1 G Gigabit Ethernet
1.2 G SATA-150
1.3 G 802.11ac 3×3 80 MHz (5 GHz)
1.5 G consumer hard disk
2.4 G SATA-300
4.8 G SATA-600
4 G USB 3.0 SuperSpeed
9.6 G 802.11ax 8×8 160 MHz (5 GHz)
10 G 10 Gigabit Ethernet
102.4 G DDR3-1600 memory

WiFi effective dBm∕MHz

Using the formula Effective Tx power (dB) = Max Tx power (dB) − 10 × log10(2Bitrate ÷ Data bandwidth − 1) − 10 × log10(Data bandwidth ÷ 1 MHz).

Standard Data bandwidth (MHz) Name Bitrate (Mbps) Max Tx power (dBm) Effective Tx power (dBm∕MHz)
802.11b 22 N/A 1 17 18.5
2 15.4
5.5 10.8
11 7.4
802.11a/g 15 N/A 6 15 8.2
9 6.1
12 4.5
18 2.1
24 0.2
36 13 −5.1
48 12 −8.9
54 11 −11.2
802.11n 16.25 HT20-0 6.5 15 7.8
HT20-1 13 4.2
HT20-2 19.5 1.8
HT20-3 26 −0.2
HT20-4 39 13 −5.4
HT20-5 52 12 −9.2
HT20-6 58.5 11 −11.6
HT20-7 65 10 −13.9
33.75 HT40-0 13.5 12 1.7
HT40-1 27 −2.0
HT40-2 40.5 −4.4
HT40-3 54 −6.4
HT40-4 81 −9.6
HT40-5 108 11 −12.4
HT40-6 121.5 10 −13.7
HT40-7 135 9 −15.0

Canon G11

Flash distance, f/2.8 / ISO100: