PRESSURE LET US START WITH AN ACTIVITY AREA YOU NEED A GLASS TUMBLER, GLASS BOWL AND WATER FILL THE BOWL WITH WATER NOW PUSH THE INTO WATER IN THE BOWL. DON’T YOU FEEL A RESISTANCE OR FORCE WHICH IS PUSHING THE GLASS UPWARDS? A FORCE WHICH IS ACTING VERTICALLY DOWNWARDS OR NORMAL TO THE SURFACE IS CALLED THRUST SO PRESSURE CAN BE DEFINED AS THRUST AREA

APPLICATIONS OF PRESSURE CUTTING AN APPLE WITH BLUNT KNIFE IS DIFFICULT COMPARED TO CUTTIN GIT WITH A SHARP KNIFE REMEMBER FOR THE SAME FORCE OR WEIGHT(APPLE), IF THE AREA IS LESS ( AREA OF THE SHARP PORTION OF KNIFE) THE VALUE OF PRESSURE WILL INCREASE MAKING US EASIER TO CUT THE APPLE . CARRYING A BAG WITH WIDE STRAPS IS EASIER THAN CARRYING A BAG WITH THIN STRAPS REMEMBER FOR THE SAME FORCE OR WEIGHT (BAG), IF THE AREA IS MORE (WIDE STRAPS), THEN THE VALUE OF PRESSURE WILL DECREASE. SO THE WEIGHT OF THE BAG WILL BE DISTRIBUTED OVER A LARGER AREA. REMEMBER: PRESSURE = FORCE AREA

UNIT OF PRESSURE REMEMBER 1N/(m x m) = 1 pascal UNIT OF FORCE IS IN NEWTONS (N) UNIT OF AREA IS IN SQUARE METRE (METRE X METRE) THEREFORE UNIT OF PRESSURE = N/ (m x m) REMEMBER 1N/(m x m) = 1 pascal

CHARACTERISTICS OF LIQUID PRESSURE DID WATER COME OUT THROUGH ALL THE HOLES? FROM WHICH HOLE DID THE WATER FALL THE FARTHEST DISTANCE? FROM WHICH HOLE DID THE WATER FALL THE CLOSEST TO THE BASE OF THE BOTTLE? THINK OF AN APPLICATION AND NARRATE

CHARACTERISTICS OF LIQUID PRESSURE HOLES ARE MADE AT THE SAME LEVEL OF A BOTTLE. WHAT IS THE CONCLUSION? THINK OF ANY APPLICATIONS OF LIQUID PRESSURE

ATMOSPHERIC PRESSURE The standard atmosphere is equivalent to 760 mmHg. What does it mean? 

APPLICATIONS WHAT IS HAPPENING IN THE ABOVE CASES?

MEASURING FLUID PRESSURE BAROMETER MANOMETER