Delta comes as the 4th letter in the greek alphabets which is spelled as 'D' in the english alphabets . In general physics, delta-v is simply a change in velocity. The Greek uppercase letter delta is the standard mathematical symbol to represent change in some quantity.
Depending on the situation, delta-v can be either a spatial vector (Δv) or scalar (Δv). In either case it is equal to the acceleration (vector or scalar) integrated over time:
(vector version)
(scalar version)
If acceleration is constant, the change in velocity can thus be expressed as:
where:
- v0 or v0 is initial velocity (at time t0),
- v1 or v1 is subsequent velocity (at time t1).
Change in velocity is useful in many cases, such as determining the change in momentum (impulse), where :
, where 
is momentum and m is mass.
1 : Physical quantities
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