Pump and Fan Efficiency - Overall pump and fan efficiency is the ratio power actually gained by the fluid to the shaft power supplied. Pumping Water - Costs - The cost of pumping water. Hydraulic Pumps and Motor Sizing - Motor size versus flow rate, shaft torque, shaft power and hydraulic power.
Finding out your baby's sex. The second scan is carried out at around 18-21 weeks, and its main purpose is to check for any structural abnormalities (anomalies) in the baby. If you want to find out the sex of your baby, you can usually do so during this scan. If you want to know your baby's sex, you should ask the sonographer (the person who carries out the scan) at the start of the scan, so they know that they need to check. You should be aware that it's not possible for the sonographer to be 100% certain about your baby's sex.
The only ways to find out the sex of your baby during pregnancy are ultrasound scans showing your baby's genital area, amniocentesis or chorionic villus sampling (CVS). You will have an ultrasound scan at some stage in your pregnancy, but amniocentesis and CVS will only be offered if you have a medical need for them. Ultrasound scans are a fairly accurate way of determining your baby's sex from about 18 weeks of pregnancy. Bear in mind that if your baby is facing the wrong way or crossing her legs during the scan, it may obscure the genital area from view.