The compressive strength of M25 concrete at 7 days will be between 6-7.5 N/mm2 .
40 MPa
20 mega-pascal of pressure
100 cm cube having less surface aera than 150 cm cube at same laoding.
Yes, the characterisrtic strength of a concrete is the same as the compressive strength
How To Gain Strength: Strength Training Basics
How To Gain Strength: Triceps Extension
How To Gain Strength: Arm Curls
How To Gain Strength: Romanian Dead Lift