why is youngs modulus for a body undergoing compressive stress positive but bulk modulus negative although in both case the force (or pressure ) causes strain in the same direction?

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$i n y o u n g s m o d u l u s w e ∆ L a s p o s i t i v e a s t h e l e n g t h i n c r e a s e s d u e t o s t r e s s . s o m i n u s i s n o t i n c l u d e d . Y = \frac{F / A}{∆ L / L} d e f i n e l o n g i t u d i n a l s t r a i n i n w h i c h l e n g t h i n c r e a s e s . w h i l e b u l k m o d u l u s B = \frac{P}{- ∆ V / V} h e r e V i s t h e v o l u m e o f t h e o b j e c t c o m p r e s s e d b y t h e p r e s s u r e P . h e n c e t h e v o l u m e w i l l d e c r e a s e h e n c e t h e - i s u s e d t o d e n o t e t h e d e c r e a s e . R e g a r d s$

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Y, K, η

K

Y

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Torque = Force \times distance

Angular momentum = momentum \times distance

Young's modulus = \frac{s t r e s s}{s t r a i n}, Stress = \frac{Force}{Area}, Strain = \frac{Change in length}{Original length}

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