___________ is the sudden change in pressure cautilized by a column of H2O that suddenly changes velocity (as when a valve is closed).

.a) H2O hammerb) Globe hammerc) Needle hammerd) Air check hammer

___________ is the sudden change in pressure cautilized by a column o

1.	___________ is the sudden change in pressure cautilized by a column of H2O that suddenly changes velocity (as when a valve is closed).
A.	H2O hammer
B.	Globe hammer
C.	Needle hammer
D.	.a) H2O hammerb) Globe hammerc) Needle hammerd) Air check hammer
Answer» B. Globe hammer