The “are” is a unit of area primarily used in land measurement, notably in countries employing the metric system. Introduced in France in 1795, it represents 100 square meters, making it a practical unit for comparing parcels of land. Interestingly, it’s the base unit for hectares, with one hectare equating to 100 ares or 10,000 square meters. While the are has been largely overshadowed by hectares in commercial and agricultural contexts, it remains a vital unit in some regions for surveying smaller plots. The persistence of the “are” in certain legal and cultural settings highlights how historical units can remain relevant despite broader shifts towards newer measurement systems.
The square kilometer is primarily used to quantify large areas of land. Fascinatingly, even though the metric system is standardized almost universally, the square kilometer remains one of the most significant units for various aspects of geography and urban planning. To put it in perspective, consider that the entire area of New York City’s Central Park measures approximately 3.41 square kilometers, which speaks volumes about its massive size within an urban environment.
Moreover, the square kilometer helps highlight the vastness of some of the world’s largest countries and cities. For instance, Russia, the largest country in the world, spans roughly 17 million square kilometers, showcasing the immense diversity and expanse of land that one country can encompass. This unit exemplifies the intriguing contrasts and scales of spaces we interact with globally.
| Ares | Square Kilometers |
|---|---|
0
a
|
0
km²
|
1
a
|
0.0001
km²
|
2
a
|
0.0002
km²
|
3
a
|
0.0003
km²
|
4
a
|
0.0004
km²
|
5
a
|
0.0005
km²
|
6
a
|
0.0006
km²
|
7
a
|
0.0007
km²
|
8
a
|
0.0008
km²
|
9
a
|
0.0009
km²
|
10
a
|
0.001
km²
|
11
a
|
0.0011
km²
|
12
a
|
0.0012
km²
|
13
a
|
0.0013
km²
|
14
a
|
0.0014
km²
|
15
a
|
0.0015
km²
|
16
a
|
0.0016
km²
|
17
a
|
0.0017
km²
|
18
a
|
0.0018
km²
|
19
a
|
0.0019
km²
|
20
a
|
0.002
km²
|
21
a
|
0.0021
km²
|
22
a
|
0.0022
km²
|
23
a
|
0.0023
km²
|
24
a
|
0.0024
km²
|
25
a
|
0.0025
km²
|
26
a
|
0.0026
km²
|
27
a
|
0.0027
km²
|
28
a
|
0.0028
km²
|
29
a
|
0.0029
km²
|
30
a
|
0.003
km²
|
31
a
|
0.0031
km²
|
32
a
|
0.0032
km²
|
33
a
|
0.0033
km²
|
34
a
|
0.0034
km²
|
35
a
|
0.0035
km²
|
36
a
|
0.0036
km²
|
37
a
|
0.0037
km²
|
38
a
|
0.0038
km²
|
39
a
|
0.0039
km²
|
40
a
|
0.004
km²
|
41
a
|
0.0041
km²
|
42
a
|
0.0042
km²
|
43
a
|
0.0043
km²
|
44
a
|
0.0044
km²
|
45
a
|
0.0045
km²
|
46
a
|
0.0046
km²
|
47
a
|
0.0047
km²
|
48
a
|
0.0048
km²
|
49
a
|
0.0049
km²
|
50
a
|
0.005
km²
|
51
a
|
0.0051
km²
|
52
a
|
0.0052
km²
|
53
a
|
0.0053
km²
|
54
a
|
0.0054
km²
|
55
a
|
0.0055
km²
|
56
a
|
0.0056
km²
|
57
a
|
0.0057
km²
|
58
a
|
0.0058
km²
|
59
a
|
0.0059
km²
|
60
a
|
0.006
km²
|
61
a
|
0.0061
km²
|
62
a
|
0.0062
km²
|
63
a
|
0.0063
km²
|
64
a
|
0.0064
km²
|
65
a
|
0.0065
km²
|
66
a
|
0.0066
km²
|
67
a
|
0.0067
km²
|
68
a
|
0.0068
km²
|
69
a
|
0.0069
km²
|
70
a
|
0.007
km²
|
71
a
|
0.0071
km²
|
72
a
|
0.0072
km²
|
73
a
|
0.0073
km²
|
74
a
|
0.0074
km²
|
75
a
|
0.0075
km²
|
76
a
|
0.0076
km²
|
77
a
|
0.0077
km²
|
78
a
|
0.0078
km²
|
79
a
|
0.0079
km²
|
80
a
|
0.008
km²
|
81
a
|
0.0081
km²
|
82
a
|
0.0082
km²
|
83
a
|
0.0083
km²
|
84
a
|
0.0084
km²
|
85
a
|
0.0085
km²
|
86
a
|
0.0086
km²
|
87
a
|
0.0087
km²
|
88
a
|
0.0088
km²
|
89
a
|
0.0089
km²
|
90
a
|
0.009
km²
|
91
a
|
0.0091
km²
|
92
a
|
0.0092
km²
|
93
a
|
0.0093
km²
|
94
a
|
0.0094
km²
|
95
a
|
0.0095
km²
|
96
a
|
0.0096
km²
|
97
a
|
0.0097
km²
|
98
a
|
0.0098
km²
|
99
a
|
0.0099
km²
|
100
a
|
0.01
km²
|
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