Pressure and Barotrauma

Welcome to All Sensors “Put the Pressure on Us” blog. This blog brings out pressure sensor aspects in a variety of applications inspired by headlines, consumer and industry requirements, market research, government activities, and you.

Pressure and Barotrauma

Changes in barometric (air) or water pressure can cause a body injury called barotrauma. There are several different types of injuries from pressure especially from diving which compresses or expands gas contained in various body structures. Common injuries including:

      • Pulmonary (lung) barotrauma
      • Mask barotrauma (mask squeeze)
      • Ear barotrauma (ear squeeze)
      • Sinus barotrauma (sinus squeeze)
      • Dental barotrauma (tooth squeeze)
      • Eye barotrauma (eye squeeze)
      • Gastrointestinal tract barotrauma (gut squeeze)

Surprisingly, the risk of barotrauma is greatest from the surface to depths of 33 feet (10 meters). Perhaps the most well-known diving barotrauma is the bends, decompression sickness or nitrogen narcosis. The basic recommendation to avoid the bends is ascending slowly from every dive with 30 ft (10 m) per minute being a safe ascent rate.

mystkittsdivebuddy - Decompression SicknessImage source:
https://mystkittsdivebuddy.com/decompression-sickness-what-you-need-to-know/

Ears are a common location for barotrauma caused by water pressure as noted above but also by a change in altitude when flying in an airplane. Common symptoms include:

      • Pain
      • A feeling of stuffy ears
      • Hearing loss
      • Dizziness

Treatments for ear barotrauma target relieving the pressure and include chewing gum and yawning. In some instances, decongestants may also help relieve the pressure.

Do you have a pressure sensing question? Let us know and we’ll address it in an upcoming blog.
Email us at [email protected]

Check That Water and Oil

Welcome to All Sensors “Put the Pressure on Us” blog. This blog brings out pressure sensor aspects in a variety of applications inspired by headlines, consumer and industry requirements, market research, government activities and you. In this blog we’ll be discussing the pressure in water and oil.

Check That Water and Oil

And don’t forget to check the tire pressure, too. A little over 50 years ago these were commonly used in the predecessors to today’s gas stations – service stations. In addition to pumping gas, the service station attendant would perform routine but often mandatory measurements. In those days, the reliability of vehicles would frequently require adding water, oil and air. Vehicle reliability has improved significantly since then. With today’s rugged and affordable sensors for pressure and other parameters, these and other measurements are performed continuously – the vehicle provides the service of monitoring itself for the driver and mechanics.

post 52

Source: https://www.pinterest.com/pin/147774431494414724/

Common pressure sensor measurements in modern vehicles include engine oil pressure, tire pressure, side airbag pressure in crash detection systems, manifold absolute pressure, barometric pressure, seat occupancy pressure and more.

 What do you think/Comments?
Do you have a pressure sensing question? Let me know and we’ll address it in an upcoming blog.
[email protected]

Pressure’s Role in Predicting Weather

Welcome to All Sensors “Put the Pressure on Us” blog. This blog brings out pressure sensor aspects in a variety of applications inspired by headlines, consumer and industry requirements, market research, government activities and you. In this blog we’ll look at how pressure helps predict weather.

Pressure’s Role in Predicting Weather

With all the harsh winter weather occurring recently, knowing what to expect in your area is important knowledge for short term planning and, in some areas such as the northeast, for long term planning. Sensing barometric pressure was one of the earliest forecasting tools and continues to be important today.

One website provides the barometric pressure history from numerous major cities in the U.S. from Friday, Feb 20 to Thursday, Feb 26. The high and low readings only tell part of the story. The intensity of the weather depends on how quickly the front develops and other factors.

City Highest pressure in period (In. Hg) Lowest pressure in period (In. Hg)
Boston 30.55 29.55
Minneapolis 30.8 29.65
Denver 30.35 29.75
San Francisco 30.35 29.85
Chicago 30.7 29.7

In stormy weather, the barometric pressure tends to be lower and a lower reading is one sign of approaching inclement weather.  During fair weather, the barometric pressure is typically higher and if the pressure begins to rise, it is a sign of tranquil weather.

According to the webpage CHANGES IN ATMOSPHERIC PRESSURE, the barometric pressure is reduced through several processes:

  • The approach of a low pressure trough
  • The deepening of a low pressure trough
  • A reduction of mass caused by upper level divergence (vorticity, jet streaks)
  • Moisture advection (moist air is less dense than dry air)
  • Warm air advection (warm air is less dense than cold air)
  • Rising air (such as near a frontal boundary or any process that causes rising air)

In the U.S., the Federal government uses pressure as part of several methods available to predict weather. On Feb26, the weather in many places around the U.S. was much less severe than it had been in recent weeks with at least one exception.

post7pic

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTH AND CENTRAL NEW MEXICO.

  • Humidity 63%
  • Wind Speed SE 20 mph
  • Barometer 30.04 in. Hg. (1017.6 mb)
  • Dew point 17°F (-8°C)
  • Visibility 9.00 mi
  • Wind Chill 15°F (-9°C)

For weather forecasting and other sensing applications, accuracy and other factors make the measurement acceptable for reliable use. That is where the expertise of the user comes into play.

What do you think/Comments?
Do you have a pressure sensing question? Let me know and I’ll address it in an upcoming blog.
-Dan DeFalco, Marketing Manager, All Sensors Corporation ([email protected])