 ## Reduction number

### Reduction number for frequencies below the critical.

Input Result
Thickness h=
Density ρ=
Frequency f=
Reduktionstal R= dB

### Reduction number for frequencies above the critical.

Input Result
Thickness h=
Density ρ=
Frequency f=
Critical frequency f=
Dissipation factor η=
Reduktionstal R= dB

### Thickness

Refers to the thickness of the current floor.

### Density

Refers to the density of the current floor layer, ie how heavy it is.

### Dissipation factor

The loss factor describes the relatively lost energy per radius.

### Frequency

The frequency is the periodic velocity of a sound wave, i.e. the number of oscillations per second the sound wave does. Frequency is measured in Hertz (Hz) which is a unit derived from the SI system and corresponds to 1 oscillation per second.

### Critical frequency

At what frequency the building component in question creates resonance.

### Reduction number

The reduction number is defined as a relationship between incident sound effect on one side of a wall and transmitted sound effect to the other side of the same wall.

### Formula

Reduction number fc>f:  