What is the most accurate instrument for checking a deep vacuum?
What is the most accurate instrument for checking a deep vacuum?
electronic vacuum gauge
Why is it a good idea to remove Schrader stems?
Why is it a good idea to remove Schrader stems from service valves prior to evacuation? A pressure of 100 microns has been reached with the vacuum pump operating. The pump is turned off and the gauge reading rises above 5,000 microns and keeps rising.
Why is it necessary to purge gauge manifold valves while they are connected?
Why do some technicians recommend using a separate refrigerant tank when purging hoses? Why is it necessary to purge gauge manifold valves while they are connected? There is a loss of refrigerant.
What breaks down to form poisonous gas in the presence of flames?
Carbon monoxide is the main toxic gas produced from the combustion of polyethylene and other organic materials that are made up of carbon and hydrogen atoms. In a fire, styrene is broken down further to smaller molecules that react with oxygen to form the usual combustion products.
Is r22 bad to breathe?
Freon is a tasteless, mostly odorless gas. When it is deeply inhaled, it can cut off vital oxygen to your cells and lungs. Limited exposure — for example, a spill on your skin or breathing near an open container — is only mildly harmful. However, you should try to avoid all contact with these types of chemicals.
What are the types of poisonous gases?
Toxic Gas List
| Gas | Toxic (NFPA Rank) |
|---|---|
| Nitrogen Dioxide | 3 |
| Ozone | 4 |
| Phosgene | 4 |
| Phosphine | 4 |
Which is the most common toxic gas created by fires?
carbon monoxide
What product of combustion causes the most deaths?
Most fatalities in fires is caused by the inhalation of incomplete products of combustion SMOKE!
- MGM Grand Hotel 1980 fire. a.
- From 1970–1985, 41 percent of fire deaths in structures were due to smoke inhalation. a.
- Products of incomplete combustion create toxic hazard in the fire-generated atmosphere.
What gases are released from fire?
The flame is the visible portion of the fire. Flames consist primarily of carbon dioxide, water vapor, oxygen and nitrogen. If hot enough, the gases may become ionized to produce plasma.
Can the smoke in the air make you sick?
Besides coughing and trouble breathing, many people experience symptoms similar to a sinus infection, such as headaches, sore throat, a runny nose and even tiredness, according to the CDC. Wildfire smoke can be especially harmful to the elderly, pregnant women, children and those with chronic heart and lung diseases.
Can you die from smoke in the air?
Even one breath of this very hot air can be lethal. Inhaling superheated gases can burn your respiratory tract whether or not the gases present are toxic. Those who suffer burns are at even greater risk as burn victims often have injuries to their lungs from inhaling hot smoke.
Is breathing fire smoke bad?
The biggest health threat from smoke is from fine particles. These microscopic particles can penetrate deep into your lungs. They can cause a range of health problems, from burning eyes and a runny nose to aggravated chronic heart and lung diseases. Exposure to particle pollution is even linked to premature death.