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Vintage USA Seamco Country Club Tennis Racquet ball Racket Platform Paddle Apta    US $9.99

MEGATOUCH MAXX DIAMOND 2 UPRIGHT ARCADE GAME LI NY    US $299.00

odl tin sheet fur tennsi ball can    US $7.50

Beer Soda Musical Bottle Opener Fridge Message Magnet Tennis Ball Shape    US $7.61

New Sportcraft brand ping pong table tennis set kit net 4 paddles and 4 balls    US $19.99

Sony Playstation 3 Move Bundle w 2 games    US $91.00

Xavix Game Console w baseball bowling tennis games    US $65.00

50 Used Tennis Balls    US $10.50

LOT OF EARLY MIDGE 1962 BARBIES CLOTHING AND ACCESSORIES 1960 ERA    US $228.00

Nike Dri Fit 2 in 1 Tennis Yoga Shorts Blue White Womens Size L    US $.99

Gamma Asterisk Tour 17g tennis string set    US $12.95

Nintendogs Dachshund Friends Nintendo DS 2005    US $5.99

Large Dog Bamboo Care Quad Brush Toothbrush 2 Bow Wow Pet Ball Toys NEW NIP    US $3.49

40 INDOOR USED TENNIS BALLS FAST FREE SHIPPING WOW LQQK WOW LQQK HERE    US $27.99

Kinect Sports Xbox 360 2010    US $42.99

Action Cartridge Sports Coaching Films Vintage 1970s    US $40.00

Sports Champions PlayStation Move Bundle Sony Playstation 3 2010    US $427.89

Hallmark ornament 1993 Perfect Match Mouse in tube of tennis balls QX5772    US $.99

BRAND NEW SEALED FLINGSMASH NINTENDO WII GAME BONUS MOTION PLUS REMOTE BLACK    US $18.50

1987 Claudia Konde Kilsch Professional Tennis Player hitting ball Press Photo    US $9.88

1987 Claudia Konde Kilsch Professional Tennis Player ball a racket Press Photo    US $9.88

Babolat Pure Drive Roddick GT Plus 4 5 8 Grip Tennis Racquet    US $84.99

Mario Power Tennis Nintendo GameCube 2004    US $8.00

OLD TENNIS BALL TIN SHEETS    US $2.00

Brand New Kinect Sports Xbox 360c 2010 Sealed    US $28.00

1986 Grace Kim Professional Tennis Player watching ball Press Photo    US $9.88

Jugs Pitching Machine    US $750.00

Vintage DOWN SLEEPING BAG by REI    US $129.00

Nintendogs Dalmatian Friends Nintendo DS 2006    US $6.00

Luxilon Big Banger Power 16L    US $10.00

1986 Claudia Konde Kilsch Professional Tennis Player hitting ball Press Photo    US $9.88

Vintage Ken TIME FOR TENNIS Outfit 790 62 63 Barbie b    US $39.00

Vintage Ken TIME FOR TENNIS Outfit 790 62 63 Barbie a    US $45.00

NIKE DRI FIT BASE TANK CAMI TOP SHIRT GYM YOGA RUN BALL TENNIS SOCCER MED 8 9 10    US $10.51

MENS NIKE DRI FIT GOLF POLO TSHIRT SPORTS BALL GYM SIZE SMALL SML SM S GUYS EUC    US $2.50

NIKEFIT DRY GOLF POLO SHIRT DRI SPORTS BALL GYM SIZE LARGE LRG LG L GUYS EUC    US $3.92

1986 Anders Jarryd Professional Tennis Player hitting ball Press Photo    US $9.88

Wii Sports Wii 2006 Video Game For Wii System Tennis Bowling Baseball Boxing    US $20.51

vintage Reebok Tennis Bag Global Collection beautiful blue color NEW    US $9.97

NINTENDOGS CHIHUAHUA FRIENDS NINTENDO DS LITE DSI XL 3DS VGC NM COMPLETE    US $9.95

1985 Johan Kriek Professional Tennis Player hitting ball Press Photo    US $9.88

NWT LULULEMON RUN WEIGHTLESS SKIRT DEWBERRY SIZE 2    US $70.34

Tennis The Smashing Card Game by Parker Brothers from 1976 Complete    US $4.99

1985 Johan Kriek Professional Tennis Player ball on racket Press Photo    US $9.88

FlingSmash Wii 2010 Black Wii MotionPlus Remote Included    US $16.50

A BEAUTIFUL VALENTINE GOLF CHARM BRACELET G115 FROM GOLF JEWEL    US $9.99

NEW Mens JAMAICA JAXX Short Sleeve Green Yellow Polo Shirt Medium with Tags    US $8.50

J C Higgins Sears Roebuck Single Stage Flyreel    US $14.99

Nintendogs Chihuahua Friends Nintendo DS 2005    US $14.99

ROCKET DOG SNEAKERS ATHLETIC SIZE 10M WOMENSS BLACK MULTI COLORED SPLATTER    US $17.00

1985 Andrea Jaeger Professional Tennis Player watching ball Press Photo    US $9.88

Womens shoesboots sandals Talbots tennis shoes sz 85 white    US $9.99

Nike Womens Cap Hat Running Tennis Blue DRIFIT Featherlight NWT $20    US $11.51

25 Used Tennis Balls    US $.99

Gordon Bradt Kinetico Tennis Player Motorized Sculptutre WORKING Kinectic    US $99.00

MSV FOCUS HEX TENNIS STRING 18L110mm NEW    US $8.00

Nike Womens Cap Hat Tennis Golf Blue DRIFIT Heritage 86 NWT $20    US $9.99

NSD TECHNO POWERBALL The power ball of masters Built in SCROLLING SPEEDMETER    US $17.99

1909 1914 Colgate University Photo Album of LB Chapman ONE OF A KIND PHOTOS    US $270.00

Nintendogs Lab Friends Nintendo DS 2005    US $7.99

Vintage Sealed Dunlop Tennis Balls WHITE    US $40.00

1985 Aaron Krickstein Professional Tennis Player hitting ball Press Photo    US $9.88

Nintendogs Dalmatian Friends Nintendo DS 2006    US $9.99

16 USED TENNIS BALLS EXCELLENT CONDITION    US $5.00

1985 Aaron Krickstein Professional Tennis Player ball on racket Press Photo    US $9.88

2 dozen Lot Round Glass Ornaments Clear Glass NEW PAINT PERSONALIZE FILL    US $16.16

BRAND NEW SEALED FlingSmash with Wii Remote Motion Plus Wii 2010    US $29.99

NIKE SHOX YOUTH TENNIS SHOES    US $61.00

Vo Toys 3pk Embroidered Dog Toy Tennis Balls w Squeaker    US $5.99

LUGZ YOUTH TENNIS SHOES    US $65.00

Rare genuine Chanel tennis ball leather strappy shoes 365 6 in white    US $149.99

Nintendogs Lab Friends Nintendo DS 2005    US $.99

Nintendo Wii Black Limited Edition Sports Resort Bundle    US $66.00

FlingSmash Wii 2010 BRAND NEW SEALED WII REMOTE    US $17.52

Tom and Jerry Classic Collection 7DVD Set142 Episodes    US $33.95

Ultimotion Swing Zone Sports Motion Control Video Game    US $17.49

ANTIQUE BISQUE FIGURINE TENNIS PLAYER W LGBASKET GERMANY    US $32.00

9 DVD`s SELECT FROM OVER 1500 TITLES DRAMA COMEDY HORROR CHILDRENS MYSTERY    US $14.95

1 Lovely GOURD with round base skinny neck bigger handle    US $3.00

Wholesale New 20 Tennis Shape Spacer Charms Beads Fit Bracelet 12mm 151717    US $5.99

1 2 3 MAN PERSON WATER BALLOON LAUNCHER SLING SHOT CHRISTMAS X MAS GIFT KING NEW    US $9.89

BLACK 300YD MEGA WATER BALLOON LAUNCHER SLING SHOT KING AGUA SLINGSHOT SLINGER    US $19.97

1 2 3 ONE THREE MAN PERSON HUMAN WATER BALLOON BOMB LAUNCHER SLINGSHOT CATAPULT    US $12.89

TTMASTER INSIDER Lange Noppe OX red NEU    US $1.31

TTMASTER INSIDER Lange Noppe OX black NEU    US $1.31

A BEAUTIFUL VALENTINE GOLF CHARM BRACELET G100A FROM GOLF JEWEL    US $16.99

A BEAUTIFUL VALENTINE GOLF CHARM BRACELET G125 FROM GOLF JEWEL    US $11.99

A BEAUTIFUL VALENTINE GOLF CHARM BRACELET G130 FROM GOLF JEWEL    US $11.99

A BEAUTIFUL VALENTINE GOLF CHARM BRACELET G135 FROM GOLF JEWEL    US $11.99

A BEAUTIFUL VALENTINE GOLF CHARM BRACELET G155 FROM GOLF JEWEL    US $9.99

A BEAUTIFUL VALENTINE GOLF CHARM BRACELET G170 FROM GOLF JEWEL    US $11.99

A BEAUTIFUL VALENTINE GOLF CHARM BRACELET L115 FROM GOLF JEWEL    US $11.99

A BEAUTIFUL VALENTINE HOME CHARM BRACELET H100 FROM GOLF JEWEL    US $16.99

A BEAUTIFUL VALENTINE HOME CHARM BRACELET H105 FROM GOLF JEWEL    US $14.99

Kinect Sports Season 1 Xbox 360 2010 Brand New Fast Shipping    US $17.93

Nintendo Wii Video Game System w BONUS Wii Play Game    US $61.01

NIB Table Tennis Attached to your Table    US $15.99

Wilson Championship XD Tennis Balls $3.99 Wilson Championship XD Tennis Balls

PetSport USA Mint Tennis Balls $2.59 PetSport USA Mint Tennis Balls

Zanies Naughty & Nice Tennis Balls $1.39 Zanies Naughty & Nice Tennis Balls

Balls Out: Gary The Tennis Coach $19.99 Balls Out: Gary The Tennis Coach

Tennis Paw Print Tennis Balls $5.99 SPOT PP MINT TENNIS BALLS-6PK Mint Flavor Tennis Balls 6 pk Mint Flavor, Paw Print Tennis Balls, yum!! Hours of chewing fun SPOT PP MINT TENNIS BALLS-2PK Mint Flavor Tennis Balls 2 pk Mint Flavor, Paw Print Tennis Balls, yum!! Hours of chewing fun

Tennis Ballport-36 Balls: SP $25.52 Pick-up, dispense and store tennis balls...Made of durable polypropylene... Ideal for instruction, teaching pros and schools...UPS.

Penn Practice Tennis Balls $103.04 Penn Practice Coach Practice Quality. These tennis balls are an economical alternative for teaching or practice.Penn Coach Practice tennis balls are the same quality tennis balls you'd expect from Penn, just with slight cosmetic blemishes. While these cosmetic blemishes don't affect the playability of the ball, they are enough to prevent them from passing Penn's stringent quality control.Case of 24 Cans - 3 Balls Per Can

US Open Orange Jr Tennis Balls $3.99 US Open Orange Jr Tennis Balls

Milk Chocolate Tennis Balls: 2LBS $21 Milk Chocolate Tennis Balls: 2LBS Fan of tennis? Milk chocolate tennis balls will be your next favorite candy! Each pound contains approximately 72 pieces of chocolate. FLAVOR: Milk chocolate

SPOT Mini Tennis Balls with Catnip Cat Toy $1.59 SPOT Mini Tennis Balls with Catnip Cat Toy

Hyper Products Hyper Blaze Orange Tennis Balls $4.99 Hyper Products Hyper Blaze Orange Tennis Balls

Grriggles Classic Tennis Balls Dog Toy $6.19 Grriggles Classic Tennis Balls Dog Toy

Canine Hardware Chuckit! Tennis Balls Dog Toy $3.29 Canine Hardware Chuckit! Tennis Balls Dog Toy

Kong Air Squeaker Tennis Balls Dog Toy $2.59 Kong Air Squeaker Tennis Balls Dog Toy

tennis balls?

how/why are tennis balls are solid in pressurized cans (hind: each tennis ball contains gases at elevated pressure to give it a good bounce)

The pressure in the can keeps the pressure in the ball from leaking out by equalizing the pressure on both sides of the ball. If the can wasn't pressurzed, the gas inside the balls would leak out through the rubber pores and they'd "go flat" or lose their pressure.