Young's Modulus is defined as follows:
Young's modulus or Young modulus is a mechanical property that measures the stiffness of a solid material
In the case of AWS Elastic Compute Cloud (EC2), the analogy of this physical property is provided via the AutoScaling feature -- as one stresses the system, it can accomodate more force. Considering just the case where one applies autoscaling based on cloudwatch alarms:
What is the maximum elasticity that EC2 autoscaling can provide?