How heavy is a megabyte?
Format	capacity (btyes)	*	weight		lbs/Mbyte
35 mm color slide	1000000000	e	0.03	oz	0.0000019
continuous tone b&w 35 negative	300000000	e	0.03	oz	0.0000063
4MM DAT	1300000000	a	1.1	oz	0.000053
8 mm videotape	2200000000	a	2.2	oz	0.000063
CD-ROM disk	650000000	a	1.1	oz	0.00011
human brain	20000000000	e	3.5	lb	0.00018
233-ipi halftone negative	100000000	e	0.3	oz	0.00019
12 inch video disk, 2 hours	1800000000	e	5.5	oz	0.00019
Scitex res-24 film, 5 x 7	80000000	a	0.3	oz	0.00023
VHS tape, 2 hours	1800000000	e	8.5	oz	0.00030
WORM disk	800000000	a	4.5	oz	0.00035
rewriteable optical disk	600000000	a	4.5	oz	0.00047
2,000 dpi 35 mm slide	3800000	a	0.03	oz	0.00049
linotronic film, 5 x 7	27000000	a	0.25	oz	0.00058
microfilm, 1 roll	300000000	a	10.5	oz	0.0022
33 rpm record	60000000	e	4.5	oz	0.0047
SyQuest cartridge	44000000	a	6.5	oz	0.0092
cassette tape, 90 minutes	9800000	e	1.5	oz	0.0096
street map	8000000	e	1.5	oz	0.012
1-inch videotape, 1 hour	920000000	e	11	lb	0.012
bernoulli drive	20000000	a	4.5	oz	0.014
1 MB RAM chip	1000000	a	0.4	oz	0.025
5.25 inch HD floppy dish	1440000	a	0.6	oz	0.026
9 track IBM tape	240000000	a	14	lb	0.058
microfiche of typing	100000	a	0.1	oz	0.063
3.5 inch floppy, two sided	800000	a	0.8	oz	0.063
256K RAM chip	256000	a	0.4	oz	0.10
5.25 inch floppy dish (two sided)	360000	a	0.6	oz	0.10
telephone directory	19000000	e	4.5	lb	0.24
softcover book, no pictures	450000	e	5	oz	0.69
newspager, no photos	1800000	e	1.3	lb	0.72
typewritten pages, 1 ream	1200000	e	5.5	lb	4.6
paper tape, 10 feet	960	a	0.8	oz	52
Hollerith card	80	a	0.2	oz	156
clay tablet	1000	e	4.4	lb	4400
transistor	1	a	0.2	oz	12500
vacuum tube	1	a	1.5	oz	93750
relay switch	1	a	4.5	oz	281250
* a = actual, e = estimated
data from an old copy of Byte

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