spirometer

"The recipe calls for a precise measure of baking soda. "

"My teacher said I could retake the test if I studied hard. "

"The after-school program is a great way for kids to continue learning. "

"The water bottle's capacity is 500 milliliters. "

"The teacher had much patience with the struggling students. "

"The violinist was a master of her instrument."

"Keep a firm hold on the handlebars."

"I breathed in a lungful of smoke by mistake, and started to cough."

"If you still feel unwell tomorrow, see your doctor."

"The student used a calculator to solve the math problem. "

"We measured the temperature with a thermometer.   You should measure the angle with a spirit level."

"We need our lungs to breathe and get oxygen from the air. "