The kilogram, the base unit of mass in the International System of Units (SI), has a fascinating history tied to a physical artifact. Until 2019, it was defined by Le Grand K, a platinum-iridium cylinder stored in a vault in France. However, even slight surface contamination or material wear could alter its mass. To ensure a more stable and universally consistent measure, the kilogram is now defined by the Planck constant—a fundamental constant of nature—using a Kibble balance. This revolutionary change marked a significant milestone in metrology and brings mass measurement into line with other SI units that are already defined by fundamental constants, rather than physical objects.
A microgram is an incredibly tiny unit of mass, equivalent to one-millionth of a gram or one-thousandth of a milligram. This minuscule measurement finds its importance in fields requiring immense precision, such as pharmacology and environmental science, where even the slightest variation can have significant implications. For instance, certain powerful pharmaceuticals are administered in microgram doses to ensure both effectiveness and safety, highlighting just how critical this precision is.
Interestingly, the mass of a single human hair is roughly 100 micrograms, giving a tangible sense of how small this unit truly is. Also, scientists often use micrograms to measure pollutants in air quality studies, as even microgram concentrations of pollutants can greatly impact human health and the environment. This demonstrates the microgram’s pivotal role in both advancing scientific understanding and ensuring public safety.
Kilograms | Micrograms |
---|---|
0
kg
|
0
mcg
|
1
kg
|
1e+9
mcg
|
2
kg
|
2e+9
mcg
|
3
kg
|
3e+9
mcg
|
4
kg
|
4e+9
mcg
|
5
kg
|
5e+9
mcg
|
6
kg
|
6e+9
mcg
|
7
kg
|
7e+9
mcg
|
8
kg
|
8e+9
mcg
|
9
kg
|
9e+9
mcg
|
10
kg
|
1e+10
mcg
|
11
kg
|
1.1e+10
mcg
|
12
kg
|
1.2e+10
mcg
|
13
kg
|
1.3e+10
mcg
|
14
kg
|
1.4e+10
mcg
|
15
kg
|
1.5e+10
mcg
|
16
kg
|
1.6e+10
mcg
|
17
kg
|
1.7e+10
mcg
|
18
kg
|
1.8e+10
mcg
|
19
kg
|
1.9e+10
mcg
|
20
kg
|
2e+10
mcg
|
21
kg
|
2.1e+10
mcg
|
22
kg
|
2.2e+10
mcg
|
23
kg
|
2.3e+10
mcg
|
24
kg
|
2.4e+10
mcg
|
25
kg
|
2.5e+10
mcg
|
26
kg
|
2.6e+10
mcg
|
27
kg
|
2.7e+10
mcg
|
28
kg
|
2.8e+10
mcg
|
29
kg
|
2.9e+10
mcg
|
30
kg
|
3e+10
mcg
|
31
kg
|
3.1e+10
mcg
|
32
kg
|
3.2e+10
mcg
|
33
kg
|
3.3e+10
mcg
|
34
kg
|
3.4e+10
mcg
|
35
kg
|
3.5e+10
mcg
|
36
kg
|
3.6e+10
mcg
|
37
kg
|
3.7e+10
mcg
|
38
kg
|
3.8e+10
mcg
|
39
kg
|
3.9e+10
mcg
|
40
kg
|
4e+10
mcg
|
41
kg
|
4.1e+10
mcg
|
42
kg
|
4.2e+10
mcg
|
43
kg
|
4.3e+10
mcg
|
44
kg
|
4.4e+10
mcg
|
45
kg
|
4.5e+10
mcg
|
46
kg
|
4.6e+10
mcg
|
47
kg
|
4.7e+10
mcg
|
48
kg
|
4.8e+10
mcg
|
49
kg
|
4.9e+10
mcg
|
50
kg
|
5e+10
mcg
|
51
kg
|
5.1e+10
mcg
|
52
kg
|
5.2e+10
mcg
|
53
kg
|
5.3e+10
mcg
|
54
kg
|
5.4e+10
mcg
|
55
kg
|
5.5e+10
mcg
|
56
kg
|
5.6e+10
mcg
|
57
kg
|
5.7e+10
mcg
|
58
kg
|
5.8e+10
mcg
|
59
kg
|
5.9e+10
mcg
|
60
kg
|
6e+10
mcg
|
61
kg
|
6.1e+10
mcg
|
62
kg
|
6.2e+10
mcg
|
63
kg
|
6.3e+10
mcg
|
64
kg
|
6.4e+10
mcg
|
65
kg
|
6.5e+10
mcg
|
66
kg
|
6.6e+10
mcg
|
67
kg
|
6.7e+10
mcg
|
68
kg
|
6.8e+10
mcg
|
69
kg
|
6.9e+10
mcg
|
70
kg
|
7e+10
mcg
|
71
kg
|
7.1e+10
mcg
|
72
kg
|
7.2e+10
mcg
|
73
kg
|
7.3e+10
mcg
|
74
kg
|
7.4e+10
mcg
|
75
kg
|
7.5e+10
mcg
|
76
kg
|
7.6e+10
mcg
|
77
kg
|
7.7e+10
mcg
|
78
kg
|
7.8e+10
mcg
|
79
kg
|
7.9e+10
mcg
|
80
kg
|
8e+10
mcg
|
81
kg
|
8.1e+10
mcg
|
82
kg
|
8.2e+10
mcg
|
83
kg
|
8.3e+10
mcg
|
84
kg
|
8.4e+10
mcg
|
85
kg
|
8.5e+10
mcg
|
86
kg
|
8.6e+10
mcg
|
87
kg
|
8.7e+10
mcg
|
88
kg
|
8.8e+10
mcg
|
89
kg
|
8.9e+10
mcg
|
90
kg
|
9e+10
mcg
|
91
kg
|
9.1e+10
mcg
|
92
kg
|
9.2e+10
mcg
|
93
kg
|
9.3e+10
mcg
|
94
kg
|
9.4e+10
mcg
|
95
kg
|
9.5e+10
mcg
|
96
kg
|
9.6e+10
mcg
|
97
kg
|
9.7e+10
mcg
|
98
kg
|
9.8e+10
mcg
|
99
kg
|
9.9e+10
mcg
|
100
kg
|
1e+11
mcg
|
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