OK I see what you're saying. Static compression is the areas of total volume the piston can pus from BTC to TDC, and that means Dynamic is the actual ratio of the A/F mixture that actually get's compressed?
NO>you are thinking about cylinder pressure
Static Compression Ratio (SCR) is the ratio most commonly referred to. It is derived from the sweep volume of the cylinder using the full crank stroke (BDC to TDC).
Dynamic Compression Ratio, on the other hand, uses the position of the piston at intake valve closing rather than BDC of the crank stroke to determine the sweep volume of the cylinder.
The difference between the two can be substantial. For example, with a cam that closes the intake valve at 70º ABDC, the piston has risen 0.9053" from BDC in a stock rod 350 at the intake closing point. This decreases the sweep volume of the cylinder considerably, reducing the stroke length by almost an inch. Thereby reducing the compression ratio. This is the only difference between calculating the SCR and the DCR.
All other values used in calculating the CR are the same. Note that the DCR is always lower than the SCR.
Dynamic compression ratio should not to be confused with cylinder pressure.
Cylinder pressures change almost continuously due to many factors including RPM, intake manifold design, head port volume and efficiency, overlap, exhaust design, valve timing, throttle position, and a number of other factors.