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.
The milligram, a unit of mass equal to one-thousandth of a gram, is pivotal in fields like pharmacology and chemistry, where precise measurement is essential. Although nearly imperceptible to the human eye, milligrams underpin the dosage of various medications, ensuring both safety and efficacy. A typical aspirin tablet, for example, generally contains 325 milligrams, showcasing how these small units add up to make a noticeable impact on our health.
Interestingly, the milligram plays a significant role in nutrition as well. The recommended daily intake of certain vitamins and minerals is often measured in milligrams. Vitamin C, vital for a healthy immune system, is recommended at about 65 to 90 milligrams per day for adults, highlighting the milligram’s crucial influence on maintaining our well-being.
| Kilograms | Milligrams |
|---|---|
0
kg
|
0
mg
|
1
kg
|
1000000
mg
|
2
kg
|
2000000
mg
|
3
kg
|
3000000
mg
|
4
kg
|
4000000
mg
|
5
kg
|
5000000
mg
|
6
kg
|
6000000
mg
|
7
kg
|
7000000
mg
|
8
kg
|
8000000
mg
|
9
kg
|
9000000
mg
|
10
kg
|
1e+7
mg
|
11
kg
|
1.1e+7
mg
|
12
kg
|
1.2e+7
mg
|
13
kg
|
1.3e+7
mg
|
14
kg
|
1.4e+7
mg
|
15
kg
|
1.5e+7
mg
|
16
kg
|
1.6e+7
mg
|
17
kg
|
1.7e+7
mg
|
18
kg
|
1.8e+7
mg
|
19
kg
|
1.9e+7
mg
|
20
kg
|
2e+7
mg
|
21
kg
|
2.1e+7
mg
|
22
kg
|
2.2e+7
mg
|
23
kg
|
2.3e+7
mg
|
24
kg
|
2.4e+7
mg
|
25
kg
|
2.5e+7
mg
|
26
kg
|
2.6e+7
mg
|
27
kg
|
2.7e+7
mg
|
28
kg
|
2.8e+7
mg
|
29
kg
|
2.9e+7
mg
|
30
kg
|
3e+7
mg
|
31
kg
|
3.1e+7
mg
|
32
kg
|
3.2e+7
mg
|
33
kg
|
3.3e+7
mg
|
34
kg
|
3.4e+7
mg
|
35
kg
|
3.5e+7
mg
|
36
kg
|
3.6e+7
mg
|
37
kg
|
3.7e+7
mg
|
38
kg
|
3.8e+7
mg
|
39
kg
|
3.9e+7
mg
|
40
kg
|
4e+7
mg
|
41
kg
|
4.1e+7
mg
|
42
kg
|
4.2e+7
mg
|
43
kg
|
4.3e+7
mg
|
44
kg
|
4.4e+7
mg
|
45
kg
|
4.5e+7
mg
|
46
kg
|
4.6e+7
mg
|
47
kg
|
4.7e+7
mg
|
48
kg
|
4.8e+7
mg
|
49
kg
|
4.9e+7
mg
|
50
kg
|
5e+7
mg
|
51
kg
|
5.1e+7
mg
|
52
kg
|
5.2e+7
mg
|
53
kg
|
5.3e+7
mg
|
54
kg
|
5.4e+7
mg
|
55
kg
|
5.5e+7
mg
|
56
kg
|
5.6e+7
mg
|
57
kg
|
5.7e+7
mg
|
58
kg
|
5.8e+7
mg
|
59
kg
|
5.9e+7
mg
|
60
kg
|
6e+7
mg
|
61
kg
|
6.1e+7
mg
|
62
kg
|
6.2e+7
mg
|
63
kg
|
6.3e+7
mg
|
64
kg
|
6.4e+7
mg
|
65
kg
|
6.5e+7
mg
|
66
kg
|
6.6e+7
mg
|
67
kg
|
6.7e+7
mg
|
68
kg
|
6.8e+7
mg
|
69
kg
|
6.9e+7
mg
|
70
kg
|
7e+7
mg
|
71
kg
|
7.1e+7
mg
|
72
kg
|
7.2e+7
mg
|
73
kg
|
7.3e+7
mg
|
74
kg
|
7.4e+7
mg
|
75
kg
|
7.5e+7
mg
|
76
kg
|
7.6e+7
mg
|
77
kg
|
7.7e+7
mg
|
78
kg
|
7.8e+7
mg
|
79
kg
|
7.9e+7
mg
|
80
kg
|
8e+7
mg
|
81
kg
|
8.1e+7
mg
|
82
kg
|
8.2e+7
mg
|
83
kg
|
8.3e+7
mg
|
84
kg
|
8.4e+7
mg
|
85
kg
|
8.5e+7
mg
|
86
kg
|
8.6e+7
mg
|
87
kg
|
8.7e+7
mg
|
88
kg
|
8.8e+7
mg
|
89
kg
|
8.9e+7
mg
|
90
kg
|
9e+7
mg
|
91
kg
|
9.1e+7
mg
|
92
kg
|
9.2e+7
mg
|
93
kg
|
9.3e+7
mg
|
94
kg
|
9.4e+7
mg
|
95
kg
|
9.5e+7
mg
|
96
kg
|
9.6e+7
mg
|
97
kg
|
9.7e+7
mg
|
98
kg
|
9.8e+7
mg
|
99
kg
|
9.9e+7
mg
|
100
kg
|
1e+8
mg
|
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