Time
时间
时间
Time 时间 is
a physical quantity 物理量 that can be measured. It
is a scalar quantity 数量
as there is no direction 向
in this quantity 数量.
Time 时间 is denoted by the symbol 符号, t. The capital T is usually used to denote the duration of time 时间, known as the period 期间. Note that the capital T is also used to denote another base quantity, temperature.
The SI unit for time 时间单位 is seconds, s.
Among the derived quantities that have time 时间 in them include:
speed,
velocity,
momentum,
acceleration,
force,
pressure,
work and
kinetic energy.
Time 时间 is divided into 24 hours, 12 hours, 60 minutes and 60 seconds according to a system which counts in 60s developed by the Babylonians.
The advantage of counting in 60s is that the number has many divisors. For example, an hour of 60 minutes can be divided into
Time 时间 is denoted by the symbol 符号, t. The capital T is usually used to denote the duration of time 时间, known as the period 期间. Note that the capital T is also used to denote another base quantity, temperature.
The SI unit for time 时间单位 is seconds, s.
Among the derived quantities that have time 时间 in them include:
speed,
velocity,
momentum,
acceleration,
force,
pressure,
work and
kinetic energy.
Time 时间 is divided into 24 hours, 12 hours, 60 minutes and 60 seconds according to a system which counts in 60s developed by the Babylonians.
The advantage of counting in 60s is that the number has many divisors. For example, an hour of 60 minutes can be divided into
| half an hour | 30 minutes |
| a third of an hour | 20 minutes |
| a quarter of an hour | 15 minutes |
| a fifth of an hour | 12 minutes |
| a sixth of an hour | 10 minutes |
If the base
10 (decimal) is used instead, the table would look
like this
| half an hour | 5 minutes |
| a third of an hour | 3.33 minutes |
| a quarter of an hour | 2.5 minutes |
| a fifth of an hour | 2 minutes |
| a sixth of an hour | 1.67 minutes |
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Masa
时间
时间
Masa merupakan kuantiti fizikal yang boleh diukur. Masa merupakan kuantiti skalar kerana ia tidak mempunyai arah.
Lazimnya, masa ditandakan dengan simbol t. Huruf besar T biasa digunakan untuk mewakili tempoh masa. Huruf besar T juga digunakan untuk menandakan satu lagi kuantiti asas iaitu suhu.
Unit SI masa ialah saat, s. Di antara kuantiti-kuantiti terbitan yang melibatkan masa termasuk: laju, halaju, momentum, pecutan, daya, tekanan, kerja and tenaga kinetik.
Masa dibahagikan kepada 24 jam, 12 jam, 60 minit dan 60 saat mengikut sistem hitungan 60 yang dicipta oleh orang-orang Babylon.
Kebaikan sistem hitungan 60 adalah nombor tersebut mempunyai banyak pembahagi. Sebagai contoh, sejam dengan 60 minit boleh dibahagikan kepada
| setengah jam | 30 minit |
| satu per tiga jam | 20 minit |
| sesuku jam | 15 minit |
| satu per lima jam | 12 minit |
| satu per enam jam | 10 minit |
Sekiranya
nombor asas 10 (sistem perpuluhan)
digunakan, jadual di atas akan menjadi
| setengah jam | 5 minit |
| satu per tiga jam | 3.33 minit |
| sesuku jam | 2.5 minit |
| satu per lima jam | 2 minit |
| satu per enam jam | 1.67 minit |
