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2. Ground glass joint - Wikipedia

   en.wikipedia.org/wiki/Ground_glass_joint

   Crude versions of conically tapered ground glass joints have been made for quite a while, [1] particularly for stoppers for glass bottles and retorts. [2] Crude glass joints could still be made to seal well by grinding the two parts of a joint against each other using an abrasive grit, but this led to variations between joints and they would not seal well if mated to a different joint.

3. Wellhead - Wikipedia

   en.wikipedia.org/wiki/Wellhead

   In general well heads are five nominal ratings of wellheads: 2, 3, 5, 10 and 15 (×1000) psi working pressure. They have an operating temperature range of −50 to +250 degrees Fahrenheit. They are used in conjunction with ring type seal gaskets.

4. Oil well control - Wikipedia

   en.wikipedia.org/wiki/Oil_well_control

   Pump pressure, which is also referred to as system pressure loss, is the sum total of all the pressure losses from the oil well surface equipment, the drill pipe, the drill collar, the drill bit, and annular friction losses around the drill collar and drill pipe. It measures the system pressure loss at the start of the circulating system and ...

5. How much should you have in your 401(k)? Here's how your ...

   www.aol.com/finance/average-401k-balance-by-age...

   Age 30. 1x your salary. Age 40. 3x your salary. ... three times your salary by 40, six times by 50, eight times by 60, and ten times your salary by age 67. ... you should target about $240,000 in ...

6. Pressure switch - Wikipedia

   en.wikipedia.org/wiki/Pressure_switch

   The contacts of the pressure switch may be rated a few tenths of an ampere to around 15 amperes, with smaller ratings found on more sensitive switches. Often a pressure switch will operate a relay or other control device, but some types can directly control small electric motors or other loads.

7. NEMA connector - Wikipedia

   en.wikipedia.org/wiki/NEMA_connector

   The 14-30 has a rating of 30 A, and an L-shaped neutral blade. The 14-50 has a rating of 50 A, and a straight neutral blade sized so that it does not mate with 14-30 connectors. NEMA 14-50 devices are frequently found in RV parks, since they are used for "shore power" connections of larger recreational vehicles.