Hello, Nice easy question for you all today: I would like to know how the speed of sound in steel varies with temperature. A google search didnt reveal a great deal, so if a physicist could confirm the relationship, that would be much appreciated. I know that: v = √shear modulus/density However, im also aware that both shear modulus and density ought to decrease with increasing temperature. So I suppose its a matter of which one decreases by the largest fraction for a given temperature rise! I dont know the answer. So...does the speed of sound in steel increase or decrease with increasing temeprature? A secondary question...is there any dependance on frequency? (ultrasound vs low freq for example) Thank you for your time.