Bill:
<i> THIS IS THE SKY.</i> <i> I KNOW WHAT YOU'RE SAYING.</i> <i> YOU'RE SAYING,</i>
<i> "THERE'S NOTHING THERE."</i> <i> WHAT DO YOU MEAN</i>
<i> THERE'S NOTHING THERE?</i> <i> THERE'S ENOUGH TO FLY ON.</i> <i> WANT TO SEE IT AGAIN?</i> THINGS FLY. PRETTY COOL, HUH? Captioning made possible by
NATIONAL SCIENCE FOUNDATION ♪ BILL NYE THE SCIENCE GUY ♪ ♪ BILL NYE THE SCIENCE GUY ♪ ♪ BILL, BILL, BILL, BILL,
BILL, BILL ♪ ♪ BILL NYE THE SCIENCE GUY ♪ Woman:
<i> SCIENCE RULES.</i> ♪ BILL NYE THE SCIENCE GUY ♪ <i>INERTIA IS A PROPERTY OF MATTER.</i> ♪ BILL, BILL, BILL, BILL ♪ ♪ BILL NYE THE SCIENCE GUY ♪ ♪ BILL, BILL, BILL, BILL ♪ <i> "T" MINUS SEVEN SECONDS.</i> ♪ BILL NYE THE SCIENCE GUY. ♪ Announcer:
BILL NYE THE SCIENCE GUY,
<i> BROUGHT TO YOU BY...</i> <i> WITHOUT AIR, YOU AIN'T FLYING.</i> AIR PRESSURE MAKES THINGS FLY.
THAT'S IT. FROM JUNE BUGS TO GIANT JETS THEY ALL FLY
BECAUSE OF AIR PRESSURE. YOU'RE SAYING, "HOW CAN AIR
MAKE THAT MUCH PRESSURE? "IT'S NOT LIKE IT HAS
A TEST TOMORROW OR ANYTHING. AND BESIDES, AIR IS SO LIGHT
AND, WELL, AIRY." BUT IT'S AIR PRESSURE
THAT LETS US BREATHE. AND IT'S AIR PRESSURE
THAT MAKES THE WIND BLOW. WITHOUT AIR PRESSURE,
NOTHING COULD FLY. TAKE A LOOK AT THIS. IT'S OUR PLASTIC AIRPLANE
OF SCIENCE. THIS AIRPLANE IS FLYING EVEN THOUGH
IT MAY NOT BE GOING ANYWHERE. MAYBE YOU KNOW THE FEELING. AIR MOVING OVER THE WINGS IS
CREATING WHAT SCIENTISTS CALL... MAYBE A SCIENTIST LIKE YOU
CALLS "LIFT." IT'S LIKE WHEN YOU LIFT
SOMETHING UP LIKE MAYBE YOU LIFT UP
A 400-TON JUMBO JET OR A PLASTIC AIRPLANE
OF SCIENCE. WHERE DOES THE LIFT COME FROM? IT COMES FROM MOVING AIR. WHEN THE WINGS
ARE TIPPED UP A LITTLE BIT THE MOVING AIR CREATES
DIFFERENCES IN AIR PRESSURE. THE AIR GOING
UNDERNEATH THE WINGS IS GOING A LITTLE MORE SLOWLY
THAN THE AIR GOING OVER THE TOP. WHEN AIR IS MOVING THIS WAY,
IT PUSHES THIS WAY. IT DOESN'T PUSH SO MUCH
UP OR DOWN. SO THERE'S
A LITTLE HIGHER PRESSURE UNDER THE WING THAN ON TOP. THAT DIFFERENCE IN AIR PRESSURE
CREATES LIFT. THIS THING THAT HAPPENS WITH AIR
THAT WHEN IT'S MOVING THIS WAY IT PUSHES THIS WAY
AND NOT SO MUCH SIDEWAYS <i> IS NAMED AFTER A SWISS GUY</i>
<i> NAMED BERNOULLI.</i> SO, WE CALL IT
"THE BERNOULLI EFFECT." WHEN THE WING'S CURVED ON TOP IT DOESN'T NEED TO BE TIPPED UP
AS MUCH TO GET LIFT. IT DOESN'T NEED
AS BIG OF AN ANGLE OF ATTACK. AIRPLANES FLY BECAUSE THEIR WINGS DEVELOP
DIFFERENCES IN AIR PRESSURE WHEN THEY'RE CURVED ON TOP
OR GIVEN AN ANGLE OF ATTACK. SO, AIRPLANES ARE HELD UP
BY SOMETHING WE CAN'T SEE: INVISIBLE AIR PRESSURE. HUH? NOT THAT BAD. NOT THAT BAD. WHEN WE THROW
THE PLASTIC AIRPLANE OF SCIENCE DIFFERENCES IN AIR PRESSURE
CREATED ON THE WING DEVELOP LIFT. HUH? LIFT IS WHAT MAKE
FLYING DISKS FLY. AND KITES. CHECK THIS OUT. ORDINARY BALLOON. SOME OF THE AIR WE BREATHE
IS NOW INSIDE THE BALLOON. I'VE USED THE POWER OF MY LUNGS TO FORCE MOLECULES
INTO THE BALLOON. THE MORE MOLECULES
IN THE BALLOON BOUNCING AROUND THE GREATER THE PRESSURE AND THAT PRESSURE
CAUSES THE BALLOON TO EXPAND. AIR PRESSURE. GODZILLA. DAISIES. THIS ONE? WELL, WE'RE GOING
TO HAVE TO WORK ON THAT. AIR PRESSURE GIVES
THESE BALLOONS THEIR SHAPE. WITHOUT AIR PRESSURE,
WE'D HAVE SOMETHING LIKE THIS... ALTHOUGH WATCHING BALLOONS
FLY AROUND, NOT THAT BAD. HERE'S ANOTHER EXPERIMENT
YOU CAN DO THAT SHOWS
WHAT AIR PRESSURE CAN DO. GET TWO PENCILS
AND A NICE, BIG BALLOON. NOW GET A HEAVY BOOK. THE BALLOON CAN LIFT THE BOOK. YOU CAN DO IT WITH AIR PRESSURE. SET TWO PENCILS
ON A TABLE. PLACE THE BALLOON
BETWEEN THE PENCILS WITH THE OPEN END OF THE BALLOON
HANGING OVER THE EDGE. NOW PUT THE BOOK
ON THE PENCILS. JUST BLOW INTO THE BALLOON. YOU'RE LIFTING THE BOOK WITH AIR PRESSURE
FROM YOUR BREATH. PHEW! CHECK IT OUT--
POWER-PACKED PUFFS OF AIR. AIR PRESSURE AND SCIENCE--
THEY'RE POWERFUL. Both:
SCIENCE RULES! IT'S A PRETTY GOOD DAY
FOR PARASAILING. AH, THAT WAS GREAT. ANYWAY, HERE'S THE PARACHUTE. THIS IS THE FRONT,
AND THIS IS THE BACK. BETWEEN THERE,
WE GET HIGH PRESSURE. ON TOP,
WE GET SLIGHTLY LOWER PRESSURE. THAT DIFFERENCE IN AIR PRESSURE? THAT'S WHERE
THE LIFT COMES FROM. WHOA! THAT'S A BOEING 727--
A CLASSIC JETLINER. IT'S FULL OF PEOPLE, KIDS, DOGS,
AND CHOICE OF CHICKEN OR BEEF. IT WEIGHS ALMOST 100 TONS. 100 TONS! THAT'S A LOT OF TONS
TO GET OFF THE GROUND. HOW DO WE DO IT? EVEN THOUGH WE KNOW
THERE'S THOUSANDS OF AIRPLANES TAKING OFF AND LANDING
EVERY DAY IT'S STILL A PRETTY COOL THING
TO WATCH. WISH WE COULD SEE THAT AGAIN
ON INSTANT REPLAY. WE CAN, BILL. BILL? I didn't know
you guys were up there. Go ahead. Rewind it. GIVE ME CAMERA ONE. NO, TWO. NO, THREE. Bill:
<i> THAT'S GREAT.</i> <i> CHECK OUT THE AIRPLANE'S WING.</i> <i> LOOK AT ITS SHAPE.</i> <i> THAT'S IMPORTANT,</i>
<i> BECAUSE AS THE PLANE GETS GOING</i> <i> SOME OF THE AIR'S GOING</i>
<i> TO GO OVER THE WING</i> <i> AND SOME OF THE AIR'S</i>
<i> GOING TO GO UNDER IT--</i> <i> JUST LIKE THE PLASTIC PLANE</i>
<i> OF SCIENCE.</i> THE X's ARE GOING
OVER THE TOP FAST. THE O's ARE GOING UNDERNEATH
NOT AS FAST. READY TWO. TAKE TWO. <i> IT'S THE SAME AIR</i> <i> JUST TRAVELING</i>
<i> AT DIFFERENT SPEEDS</i> <i> WHICH CREATES A DIFFERENCE</i>
<i> IN AIR PRESSURE.</i> <i> THE FASTER X's</i>
<i> CAN'T PUSH DOWN</i> <i> AS HARD</i>
<i> AS THE SLOWER O's PUSH UP.</i> <i> THE O's PUSH THE WING UP.</i> Bill:
<i> THE AIR ON TOP</i> <i> ZIPS OVER THE WING</i> <i> WHICH CREATES AN AREA</i>
<i> OF LOW PRESSURE.</i> YOU'VE GOT
HIGH PRESSURE UNDERNEATH AND LOW PRESSURE ON TOP
TO CREATE LIFT. THE X's AND O's
GET BACK TOGETHER AT THE BACK OF THE WING. READY FOR BILL? WITH AIR MOVING OVER WINGS WE CAN DEVELOP DIFFERENCES
IN AIR PRESSURE THAT CAN BE USED TO CREATE LIFT. HOW DO WE GET AIR MOVING? WITH ENGINES, BIG ENGINES. THAT'S HOW WE GET AIR MOVING. NOW LET'S KEEP THE SHOW MOVING. Woman:
<i> THIS IS THE SIMULATOR ROOM.</i> <i> THE ONE WE'RE GOING</i>
<i> TO FLY IN TODAY IS THE 767-200.</i> MY NAME IS SUZANNA DARCY. I'M A TEST PILOT
FOR THE BOEING COMPANY. I'M RATED TO FLY <i> ON THE BOEING 737,</i>
<i> THE 57, THE 67, AND 747-400.</i> <i> THIS IS THE SIMULATOR</i>
<i> THAT'S USED FOR DOING</i> <i> ALL THE TRAINING</i>
<i> FOR AIRLINE PILOTS</i> <i>AND TEST PILOTS THAT ARE GETTING</i>
<i> THEIR RATINGS ON THE 767.</i> ...PULLING BACK HERE. AND BEAUTIFUL. WE'RE FLYING. THERE'S A POSITIVE RATE
AND YOU TELL ME GEAR UP. THESE ARE THE THROTTLES
AND THEY WORK LIKE AN ACCELERATOR ON A CAR. THIS IS THE CONTROL COLUMN. WHEN YOU PULL BACK, WE GO UP. WHEN YOU PUSH FORWARD,
THE AIRPLANE WILL GO DOWN. <i> MOST PEOPLE WOULD NOT</i>
<i> CALL PILOTS SCIENTISTS</i> <i> BUT YOU NEED</i> A LOT OF MATH AND SCIENCE. WHEN WE HIT THE GROUND,
I PULL THIS BACK? I'LL HELP YOU. THERE'S 50 FEET. THE AIRPLANE STARTS
TO FLARE AUTOMATICALLY. RIGHT THERE, TOUCH DOWN. COME UP. <i> YOU CAN FEEL</i>
<i> THE BRAKES COMING ON.</i> ALTITUDES ARE NUMBERS. HEADINGS ARE NUMBERS. AIR SPEEDS ARE NUMBERS. AN AIRPLANE IS REALLY JUST A FUN
APPLICATION OF MATHEMATICS. ARE YOU SURE YOU HAVEN'T
DONE THIS BEFORE? YOU, ME, AIR, EVERYTHING
IS MADE OF MOLECULES-- LITTLE PIECES OF STUFF. AND WHEN THINGS
LIKE AIR MOLECULES GET MOVING THEY CAN EXERT PRESSURE. HERE. TAKE A LOOK AT
THE MOLECULE MACHINE OF SCIENCE. SEE THE LITTLE BALLS? THEY'VE MOVING
LIKE MOVING AIR MOLECULES AND THEY EXERT A PRESSURE
ON THIS PAPER DISK. NOW, WHAT WOULD HAPPEN IF I MOVED THE PAPER DISK UP
REAL FAST? THE MOLECULES SPREAD APART. THEY EXPAND. THEY WANT TO EXERT A PRESSURE
IN THE DIRECTION THEY'RE GOING-- ALONG THE TUBE. THEY DON'T EXERT AS MUCH
PRESSURE THIS WAY OR THIS WAY. <i> THAT'S BERNOULLI'S PRINCIPLE.</i> IT'S THE SAME PRESSURE YOU FEEL
WHEN RIDING YOUR BIKE. EXCUSE ME. I'M GOING TO GENERATE
A LITTLE WIND HERE IN THE LAB. YOU FEEL WIND ON YOUR FACE. YOU FEEL PRESSURE. YOU DON'T FEEL AS MUCH PRESSURE
ON THE BACK OF YOUR HEAD. THIS PRESSURE IS CALLED
DYNAMIC PRESSURE... THE PRESSURE OF MOVING AIR. THE SAME THING HAPPENS
ON AN AIRPLANE WING. SUPPOSE WE HAD AN AIRPLANE WING LIKE THE PLASTIC AIRPLANE WING
OF SCIENCE. AS AIR GOES OVER IT,
THE AIR GOING UNDER EXERTS A LITTLE PRESSURE
ON THE BOTTOM BUT THE AIR GOING OVER THE TOP
DOESN'T EXERT AS MUCH PRESSURE THIS WAY, THIS WAY,
THIS WAY, OR THIS WAY. SO WE GET LIFT. LIFT-- IT'S ALL DONE
WITH MOLECULES. SEE YA. HERE'S AN EXPERIMENT
YOU CAN TRY THAT SHOWS THE DIFFERENCE BETWEEN HIGH AND LOW
AIR PRESSURE. ALL YOU NEED IS SOME STRING,
TAPE, A STRAW AND TWO PING-PONG BALLS
HUNG UP LIKE THESE. TAKE THE STRAW AND BLOW AIR
BETWEEN THE BALLS. WHAT WILL HAPPEN? OKAY, SO YOU HAVE
YOUR PING-PONG BALLS SET UP. WHAT DO YOU THINK WILL HAPPEN? YOU MIGHT THINK THAT THE AIR
GOING BETWEEN THE BALLS WILL PUSH THEM APART,
BUT WHEN YOU TRY IT... THEY GET CLOSER TOGETHER. <i> THAT'S BECAUSE</i>
<i> THE FAST-MOVING AIR</i> <i> HAS LOWER SIDEWAYS AIR PRESSURE</i>
<i> THAN SLOW-MOVING AIR.</i> <i> SO, THE FASTER AIR</i>
<i> GOING BETWEEN THE BALLS</i> <i> MAKES THE PRESSURE ON THEM</i>
<i> DROP.</i> <i> SINCE THE AIR OUTSIDE THE BALLS</i>
<i> HAS HIGHER PRESSURE</i> <i> IT MOVES THE BALLS</i>
<i> CLOSER TOGETHER.</i> THIS IS CALLED
THE BERNOULLI EFFECT <i> NAMED AFTER THE SWISS GUY</i>
<i> WHO DISCOVERED THIS PRINCIPLE.</i> THE BERNOULLI EFFECT MAKES BIRDS, AIRPLANES,
AND KITES FLY. SWITZERLAND IS ALSO KNOWN
FOR CHOCOLATES, SWISS CHEESE AND CUCKOO CLOCKS. BERNOULLI--
HE WAS ONTO SOMETHING, HUH? NORTHWEST 7 HEAVY,
READY FOR DEPARTURE. NORTHWEST 7 HEAVY RUNWAY 1-6 LEFT,
TAXI IN POSITION... Laurence Randolph, Jr.:
<i> WHAT I DO FOR A LIVING</i> IS I'M AN AIR TRAFFIC
CONTROL SPECIALIST. AIRPORT 21 HEAVY... RUNWAY 1-6 LEFT
CLEARED FOR TAKEOFF. Randolph:
<i> THE AIRPLANES TALK TO US</i>
<i> AT ALL TIMES.</i> <i> FROM THE TIME</i> <i> THEY PUSH BACK OFF THE GATE,</i>
<i> UNTIL THEY LAND AGAIN</i> <i> THEY'RE TALKING</i>
<i> TO AN AIR TRAFFIC CONTROLLER.</i> <i> OUR JOB INVOLVES SCIENCE</i>
<i> EVERY DAY.</i> WIND 20-0-1-0.
RUNWAY 1-6 CLEARED TO LAND. <i> I DECIDED TO BE</i>
<i> AN AIR TRAFFIC CONTROLLER</i> <i> IN THE SIXTH GRADE.</i> I GOT FASCINATED IN FLIGHT <i> AND DIFFERENT</i>
<i> SCIENTIFIC FORMULAS.</i> <i> THEN I FOUND OUT</i>
<i> I HAD TO KNOW ABOUT CLOUDS</i> <i> AND PRECIPITATION</i> <i> AND SCIENCE BECAME</i>
<i> MY FAVORITE SUBJECT.</i> IN FACT, IT WAS MY BEST SUBJECT. <i> IF YOU FIND OUT</i>
<i> WHAT YOU WANT TO DO</i> <i> AT A YOUNG ENOUGH AGE</i> <i> THEN YOU CAN STRIVE FOR IT</i>
<i> WHEN YOU GET OLDER.</i> <i> ANYONE CAN ACHIEVE A GOAL</i> <i> IF YOU STRIVE FOR IT</i>
<i> AND PUSH FOR IT HARD ENOUGH.</i> Announcer:
<i> WRIGHT BROTHERS--</i> <i> FIRST TO FLY AN AIRPLANE</i>
<i> WITH AN ENGINE.</i> <i> CHARLES LINDBERGH--</i> <i> FIRST PERSON TO FLY ALONE</i>
<i> ACROSS THE ATLANTIC.</i> <i> AMELIA EARHART</i> <i> FIRST WOMAN TO PILOT A PLANE</i>
<i> ACROSS THE ATLANTIC.</i> <i> WHAT DO THESE THREE</i>
<i> HAVE IN COMMON?</i> <i> ...THIS WEEK</i>
<i> ON</i> THE JOHNNY LIFT SHOW. THIS LOOKS LIKE
AN ORDINARY WING. IT IS AN ORDINARY WING,
ONLY IT'S REALLY SMALL. SCIENTISTS TEST WINGS,
NOT IN THE WILD ANYTHING-CAN-HAPPEN
WORLD OF THE OUTDOORS BUT IN HERE. THIS IS A WIND TUNNEL. A TUNNEL WITH WIND! <i> REMEMBER WHEN WE WERE FLYING</i>
<i>OUR PLASTIC AIRPLANE OF SCIENCE?</i> <i> IT DIDN'T MAKE ANY DIFFERENCE</i> <i> WHETHER WE WERE FLYING IT</i>
<i> IN FRONT OF A FAN</i> <i> OR FLYING IT WITH A TOSS.</i> <i> THE WINGS LIFT THE SAME WAY.</i> SEE, PLANES TAKE OFF AND LAND
TOWARD THE WIND. THAT WAY, WHETHER
THEY'RE SPEEDING UP TO TAKE OFF OR SLOWING DOWN TO LAND THERE'S ALREADY AIR
MOVING OVER THE WING. NOT THAT BAD. AIRPLANES CAN GET BIG
AND COMPLICATED AND SOMETIMES LOOK
A LITTLE WEIRD. SO WE WANT TO MAKE SURE THEY FLY THE WAY
WE WANT THEM TO. IT'S EASIER, AND I DARESAY
A LOT LESS EXPENSIVE TO TEST WINGS
AND AIRPLANES IN HERE THAN IT IS TO GO
JUST BUILDING ONE AND SEEING WHAT HAPPENS. THESE BIG ONES FLY GREAT AND THEY WERE ALL TESTED
AS MODELS. SOME PEOPLE ARE AFRAID
THAT AIRPLANES CAN'T FLY BECAUSE THE AIR THEY FLY THROUGH
IS INVISIBLE. SO IS THE AIR WE BREATHE. I MEAN, IT'S JUST AIR. WE HUMANS HAVE FIGURED OUT WAYS
TO MAKE PRETTY GOOD WINGS AND THEY DEVELOP DIFFERENCES
IN AIR PRESSURE AND DIFFERENCES IN AIR PRESSURE,
THAT CREATES... TO GET LIFT, YOU HAVE
TO HAVE THE WING MOVING. YOU HAVE TO HAVE THE AIR MOVING. IT'S LIKE HAVING YOUR FACE
IN FRONT OF A FAN. OR LIKE
WHEN YOU'RE RIDING A BIKE. YOU FEEL THE WIND ON YOUR FACE--
THE PRESSURE OF MOVING AIR. THAT'S WHAT WE CALL... IT'S WHAT MAKES AIRPLANES FLY. A HUMAN ON A BICYCLE
IS A VERY EFFICIENT MACHINE. THERE'S AIRPLANES NOW THAT YOU ACTUALLY GET IN
AND PEDAL FOR POWER. <i> THIS IS THE GOSSAMER ALBATROSS.</i> <i> IT WAS THE FIRST</i>
<i> HUMAN-POWERED AIRPLANE</i> <i> TO FLY ACROSS</i>
<i> THE ENGLISH CHANNEL.</i> <i> IT WAS PEDAL-POWERED</i>
<i> BY BRIAN ALLEN.</i> <i> DON'T KID YOURSELF.</i> <i> PEDALING HARD AND LONG ENOUGH</i> <i> TO KEEP AN AIRPLANE LIKE THIS</i>
<i> FLYING IS NO EASY TASK.</i> Pay attention. <i> YOU GET A WING</i>
<i> WITH AN ANGLE OF ATTACK...</i> <i> AND LIFT.</i> <i> ISN'T THAT AMAZING?</i> SCIENCE-- CHECK IT OUT. I HAVE MADE ALMOST
A MILLION OF THEM WITH KIDS. OKAY, I PUT A LINE HERE. DID YOU SEE HOW THAT HAPPENED? WE GOT THAT ONE ALL DONE. AND THERE IT IS. AIR PRESSURE. WIND. LIFT. THIS IS SCIENCE. (<i> hums fanfare</i> ) WE GOT ALL OF THEM
UP IN THE AIR. (<i> hums fanfare</i> ) THEY'RE FLYING. THEY'RE FLYING. THEY'RE FLYING. CHECK IT OUT. SCIENCE IS COOL. (<i> hums fanfare</i> ) WINGS WILL MAINTAIN LIFT AS LONG AS THEY HAVE
AN ANGLE OF ATTACK. LOOK IN HERE. NOT BAD, HUH? HELICOPTER ROTORS
WORK JUST LIKE AIRPLANE WINGS. INSTEAD OF FLYING STRAIGHT
THROUGH THE AIR, THOUGH THEY ALSO SPIN IN A CIRCLE. <i> THEY DEVELOP DIFFERENCES</i>
<i> IN AIR PRESSURE</i> <i> AND THAT DEVELOPS LIFT.</i> THEY WORK GREAT! HELICOPTERS HAVE WINGS
THAT SPIN. HERE'S HOW YOU CAN MAKE
YOUR OWN HELICOPTER. YOU'LL NEED A PIECE
OF CARDBOARD, LIKE A CEREAL BOX A PAIR OF SCISSORS,
SOME TAPE, AND A PENCIL. ANYWAY, HERE'S WHAT YOU DO. CUT YOUR HELICOPTER ROTOR BLADES
OF SCIENCE LIKE THIS-- NOTCH IT IN FOUR PLACES,
HERE, HERE, HERE, AND HERE. BEND IT AT THE END OF THE WING
IN OPPOSITE DIRECTIONS TAPE IT TO YOUR PENCIL,
AND YOU'RE READY TO GO. TAKE YOUR HELICOPTER AND SPIN IT. SEE? IT FLIES. IT WORKS JUST LIKE A REAL ONE. HERE'S ANOTHER
TYPE OF HELICOPTER. CUT A PIECE OF PAPER LIKE THIS. FOLD THESE TWO FLAPS DOWN
LIKE THIS. PUT A PAPER CLIP ON THE BOTTOM,
AND WATCH IT FLY. Both:
HELICOPTERS! SCIENCE! (<i> heavy metal rock intro</i> ) ♪ THE KITES AND PLANES
AND BUTTERFLIES ♪ ♪ HAVE THINGS IN COMMON ♪ ♪ ONE'S THE SKY ♪ ♪ THEY ALL CAN SAIL
THROUGH THE AIR ♪ ♪ AND BIRDS CAN, TOO,
WITHOUT A CARE ♪ ♪ PRESSURE, PRESSURE, PRESSURE,
PRESSURE ♪ ♪ PRESSURE, PRESSURE, PRESSURE ♪ ♪ AIR HAS PRESSURE ♪ ♪ AND IT'S MOVING
ALL AROUND US ♪ ♪ AND IT'S GROOVING ♪ ♪ NOW THESE CHANGES
IN AIR PRESSURE ♪ ♪ CREATE LIFT
THAT WE CAN MEASURE, YEAH ♪ ♪ WINGS ARE THE THINGS ♪ ♪ ALTHOUGH NOT LAST ♪ ♪ THE AIR ABOVE THEM
MOVES SO FAST ♪ ♪ TRAPPED AIR BENEATH THEM
MOVES REAL SLOW ♪ ♪ CREATES HIGH PRESSURE
TO LIFT AND GO ♪ ♪ PRESSURE, PRESSURE, PRESSURE,
PRESSURE ♪ ♪ PRESSURE, PRESSURE, PRESSURE ♪ ♪ AIR HAS PRESSURE ♪ ♪ AND IT'S MOVING
ALL AROUND US ♪ ♪ AND IT'S GROOVING ♪ ♪ NOW THESE CHANGES
IN AIR PRESSURE ♪ ♪ CREATE LIFT
THAT WE CAN MEASURE ♪ ♪ AIR PRESSURE, AIR PRESSURE ♪ ♪ AIR PRESSURE, AIR PRESSURE ♪ ♪ AIR PRESSURE. ♪ NOW YOU KNOW HOW BIRDS, BATS,
BUTTERFLIES AND AIRPLANES FLY. BASICALLY, IT'S THREE THINGS. AIR HAS PRESSURE. TO GET THINGS TO FLY WE WANT DIFFERENCES
IN AIR PRESSURE. THOSE DIFFERENCES COME FROM <i> BERNOULLI'S PRINCIPLE.</i> REMEMBER, THE SWISS GUY? AS MOLECULES OF AIR GO THIS WAY THEY DON'T EXERT
AS MUCH PRESSURE THIS WAY OR THIS WAY. <i> REMEMBER BERNOULLI'S PRINCIPLE?</i>
<i> THE SWISS GUY WITH THE CHEESE.</i> WHEN YOU GIVE A WING
AN ANGLE OF ATTACK THEN BERNOULLI'S PRINCIPLE
COMES IN AND MAKES LOW PRESSURE ON TOP
AND HIGH PRESSURE ON THE BOTTOM. THAT CREATES... <i> I'VE GOT SOME SERIOUS</i>
<i> ANGLES OF ATTACK TO DEVELOP.</i> GOTTA FLY. BILL NYE THE SCIENCE GUY. <i> SEE YA!</i> <i> PRODUCED IN ASSOCIATION WITH</i>
<i>THE NATIONAL SCIENCE FOUNDATION.</i> ♪<i> BILL, BILL, BILL, BILL,</i>
<i> BILL, BILL</i> ♪ ♪ BILL NYE THE SCIENCE GUY ♪ ♪<i> BILL, BILL, BILL, BILL,</i>
<i> BILL, BILL</i> ♪ <font color="#ffff00"> Captioning sponsored by</font>
<font color="#ffff00"> DISNEY EDUCATIONAL PRODUCTIONS</font> Captioned by
<font color="#00ffff"> Media Access Group at WGBH</font>
access.wgbh.org ♪ BILL NYE THE SCIENCE GUY ♪ ♪<i> BILL, BILL, BILL, BILL,</i>
<i> BILL, BILL</i> ♪ ♪ BILL NYE THE SCIENCE GUY ♪ ♪<i> BILL, BILL, BILL, BILL,</i>
<i> BILL, BILL.</i> ♪