Avocados are high in fat. But it's monounsaturated fat, which is a good fat that helps lower bad cholesterol, as long as you eat them in moderation. Avocados have a lot of calories. The recommended serving size is smaller than youâd expect: 1/5 of a medium avocado (or 1 ounce) is 50 calories.
Why do transformers hum? Transformer noise is caused by a phenomenon which causes a piece of magnetic sheet steel to extend itself when magnetized. When the magnetization is taken away, it goes back to its original condition. This phenomenon is scientifically referred to as magnetostriction.
Home Â» Car Maintenance Â» What Causes Engine Pinging. What Causes Engine Pinging Posted on Autos.com Editor. in Car Maintenance. on October 7, 2013. Engine pinging or knocking occurs when a pocket of the air and fuel mixture detonates ahead of the flame front ignited by the spark plug. This premature ignition causes a drastic increase in the pressures present in the cylinder, and when the two flame fronts meet, the characteristic engine pinging noise is heard.