यांत्रिकी
(aangrezi:Mechanics) yaantriki bhautik vijnan ki vah shakha hai jisamean pindoan par bal lagane ya visthapit karane par unake vyavahar ka adhyayan karati hai. yaantriki ki j dean kee prachin sabhyataoan se nikali haian.
mapan–paddhati
hamean mapan ki avashyakata kyoan p dati hai? suspasht hai, ki hamari jnanendriyaan kinhian do vastuoan ke ek jaise gun ka tulanatmak anuman karane mean to saksham haian, parantu yah anuman thik hi ho, yah avashyak nahian hai. jaise poochha jae ki bakari v gay mean kaun b da hai, to hamara uttar hoga ki gay b di hai. parantu yadi lagabhag ek saman do geandean di jaean to unamean chhote–b de ka anuman lagana b da kathin kary hai. chhote–b de ki pahachan keval anuman se nahian ho sakati, atah map–taul ki avashyakata hoti hai. isi prakar koee ghatana kis samay ghati, isako vyakt karane ke lie samay ki map ki avashyakata hoti hai. vastav mean map–taul vijnan ka adhar hai.
10 ke ghatoan mean bhautik rashiyoan ka man
| das ka ghat | upasarg | pratik |
|---|---|---|
| 1018 | eksa (Exa) | E |
| 1015 | peta (Peta) | P |
| 1012 | tera (Tera) | T |
| 109 | giga (Giga) | G |
| 106 | mega (Mega) | M |
| 103 | kilo (Kilo) | K |
| 102 | hekto (Hecto) | H |
| 101 | deka (Deca) | da |
| 10-1 | desi (Deci) | d |
| 10-2 | seanti (Centi) | c |
| 10-3 | mili (Mili) | m |
| 10-6 | maikro (Micro) | u |
| 10-9 | neno (Naino) | n |
| 10-12 | piko (Pico) | p |
| 10-15 | phemto (Fempto) | F |
| 10-18 | eto (Atto) | atto |
matrak
- REDIRECTsaancha:mukhy
kisi bhautik rashi ko vyakt karane ke lie usi prakar ki rashi ke matrak ki avashyakata hoti hai. pratyek rashi ki map ke lie usi rashi ko koee manak man chun liya jata hai. is manak ko matrak kahate haian.
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